Autotools: Replace backticks command substitutions with $(...) (#15639)

This is a follow-up of previous backticks replacement commits. This
replaces backticks command substitutions in re

Autotools: Replace backticks command substitutions with $(...) (#15639)

This is a follow-up of previous backticks replacement commits. This
replaces backticks command substitutions in remaining ext config M4
files, phpize, and configure.ac with the recommended $(...).

Note that $(...) still does not work on some obsolete shells that ship
with Solaris 10, for example. Elsewhere they should work. However, for
these obsolete shells Autoconf also re-executes the shell script under
the supported shell so it can make them work regardless.

Additionally, few comments CS are also adjusted to not cause confusion
when searching for backticks usages and one indentation sync done.

As of Autoconf 2.72 the backticks in macro help texts are also replaced
with single quotes.

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Autotools: Sync CS in extensions (#15343)

- Redundant double quotes removed
- AS_* macros used
- Few nits adjusted here and there

Sync preprocessor macros help texts (#15218)

This partially syncs help texts a bit further for:
- ext/ffi
- ext/ldap
- ext/opcache
- ext/pcre
- ext/pdo_mysql
- ext/re

Sync preprocessor macros help texts (#15218)

This partially syncs help texts a bit further for:
- ext/ffi
- ext/ldap
- ext/opcache
- ext/pcre
- ext/pdo_mysql
- ext/readline
- ext/standard

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Autotools: Replace AC_MSG_ERROR with AC_MSG_FAILURE (#15209)

This replaces the AC_MSG_ERROR with AC_MSG_FAILURE, where appropriate.

The AC_MSG_ERROR outputs given message and exits

Autotools: Replace AC_MSG_ERROR with AC_MSG_FAILURE (#15209)

This replaces the AC_MSG_ERROR with AC_MSG_FAILURE, where appropriate.

The AC_MSG_ERROR outputs given message and exits the configure step. The
AC_MSG_FAILURE does the same but also automatically outputs additional
message "See 'config.log' for more details." which might help directing
the user where to look further.

The AC_MSG_ERROR is used for errors where current test step isn't logged
in the config.log and wouldn't make sense, and AC_MSG_FAILURE is mostly
used in cases of library checks, compilation tests, headers checked with
AC_CHECK_HEADER* and similar tests that are also logged in the
config.log.

AC_MSG_ERROR([Sanity check failed.]) output:

```
configure: error: Sanity check failed.
```

AC_MSG_FAILURE([Sanity check failed.]) output:

```
configure: error: in '/path/to/php-src':
configure: error: Sanity check failed.
See 'config.log' for more details
```

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Sync HAVE_<extension> help texts (#15167)

This syncs all help texts of extension preprocessor macros to the same
style "Define to 1 if the PHP extension '<ext>' is available.".
[skip

Sync HAVE_<extension> help texts (#15167)

This syncs all help texts of extension preprocessor macros to the same
style "Define to 1 if the PHP extension '<ext>' is available.".
[skip ci]

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Autotools: Normalize and quote all PHP_NEW_EXTENSION arguments (#15144)

This adds Autoconf quote characters to all PHP_NEW_EXTENSION arguments
and syncs the CS across the php-src Autotoo

Autotools: Normalize and quote all PHP_NEW_EXTENSION arguments (#15144)

This adds Autoconf quote characters to all PHP_NEW_EXTENSION arguments
and syncs the CS across the php-src Autotools build system.

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Autotools: Quote PHP_ADD_LIB* arguments (#15112)

Following previous CS syncs, this quotes arguments in PHP_ADD_LIB* M4
macros:
- PHP_ADD_LIBRARY
- PHP_ADD_LIBRARY_WITH_PATH
-

Autotools: Quote PHP_ADD_LIB* arguments (#15112)

Following previous CS syncs, this quotes arguments in PHP_ADD_LIB* M4
macros:
- PHP_ADD_LIBRARY
- PHP_ADD_LIBRARY_WITH_PATH
- PHP_ADD_LIBPATH

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Autotools: Quote M4 arguments (#15045)

- AC_MSG_CHECKING
- AC_MSG_RESULT
- AC_MSG_WARN
- AC_MSG_ERROR
- AC_MSG_NOTICE

Autotools: Quote M4 arguments (#15033)

- PHP_ADD_INCLUDE
- PHP_EVAL_INCLINE
- PHP_EVAL_LIBLINE

Autotools: Refactor cache variables in configure.ac and ext/ldap (#14784)

- Cache variables ac_cv_ renamed on few places to php_cv_
- Over-quoted arguments reduced
- AS_VAR_IF and CS

Autotools: Refactor cache variables in configure.ac and ext/ldap (#14784)

- Cache variables ac_cv_ renamed on few places to php_cv_
- Over-quoted arguments reduced
- AS_VAR_IF and CS synced

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Autotools: Quote PHP_SUBST arguments in extensions (#14748)

Normalize AC_CHECK_FUNC* first argument (#14700)

The m4_normalize is for Autoconf < 2.70 (on 2.70 and later versions a
blank-or-newline separated items can be expanded without using

Normalize AC_CHECK_FUNC* first argument (#14700)

The m4_normalize is for Autoconf < 2.70 (on 2.70 and later versions a
blank-or-newline separated items can be expanded without using
backslash-newline).

This also syncs the 1st argument quotes.

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Update ext/ldap sanity check (#13946)

The ldap_bind_s() has been deprecated and isn't used in the code in
favor of ldap_sasl_bind_s(). PHP falls back to deprecated
ldap_simple_bind_s

Update ext/ldap sanity check (#13946)

The ldap_bind_s() has been deprecated and isn't used in the code in
favor of ldap_sasl_bind_s(). PHP falls back to deprecated
ldap_simple_bind_s() if for some reason ldap_sasl_bind_s() isn't
available and this check likewise.

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Merge branch 'PHP-7.4'

Remove defines for specific oraldap versions

These are not used for anything.

Remove support for umich_ldap

Doesn't seem to exist anymore, and their website now redirects to
openldap.

Merge branch 'PHP-7.4'

Remove nsldap support

The newest version we're checking (libssldap50) seems to be about
15 years out of date. We could add support for libssldap60 (also
unmainted, but more recent),

Remove nsldap support

The newest version we're checking (libssldap50) seems to be about
15 years out of date. We could add support for libssldap60 (also
unmainted, but more recent), but given how nobody has expressed any
interest in this, I'm going ahead and dropping this code.

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Merge branch 'PHP-7.4'

Fix detection of gmp on clang

Split the default and custom path case. If the default is used,
assume that the library must be on the default include and lib path.
Only check that the

Fix detection of gmp on clang

Split the default and custom path case. If the default is used,
assume that the library must be on the default include and lib path.
Only check that the version is appropriate.

Something similar is needed for ldap, but the checking code is much
more complex there, so I'm only adding a workaround for now.

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Merge branch 'PHP-7.4'

ext/ldap: Use PKG_CHECK_MODULES to detect the libsasl2 library

Merge branch 'PHP-7.4'

* PHP-7.4:
Normalize comments in *nix build system m4 files

Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment characte

Normalize comments in *nix build system m4 files

Normalization include:
- Use dnl for everything that can be ommitted when configure is built in
favor of the shell comment character # which is visible in the output.
- Line length normalized to 80 columns
- Dots for most of the one line sentences
- Macro definitions include similar pattern header comments now

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Merge branch 'PHP-7.4'

* PHP-7.4:
Sync AC_CHECK_SIZEOF m4 macro calls