Add -Wstrict-prototypes compiler warning

Disable it for the following extensions:
- GD
- pspell
- readline

Closes GH-5888

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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Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not

Add AS_HELP_STRING to *nix build configure options

The Autoconf's default AS_HELP_STRING macro can properly format help
strings [1] so watching out if columns are aligned manually is not
anymore.

[1] https://www.gnu.org/software/autoconf/manual/autoconf.html#Pretty-Help-Strings

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use pkg-config for libedit

add readline_list_history with libedit >= 3.1 and mingweditline

Merge branch 'PHP-7.2' into PHP-7.3

Fix rl_completion_matches detection

Also fix a typo when checking for rl_on_new_line in readline library.

Trim trailing whitespace in source code files

Trim trailing whitespaces in build files

Some editors utilizing .editorconfig automatically trim whitespaces. For
convenience this patch removes whitespaces in certain build files:
-

Trim trailing whitespaces in build files

Some editors utilizing .editorconfig automatically trim whitespaces. For
convenience this patch removes whitespaces in certain build files:
- ext/*/config*.m4
- configure.ac
- acinclude.m4

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Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Fix long-standing visual pain point: the misalignment of './configure help' text.
Whitespace changes and a couple of grammar fixes.

Fixed bug#54450 (callback function when built against libedit)

- Implement FR#53878 Interactive shell should work with shared readline extension

# This is useful w/ distributors who like to build all things shared or don't
# provide the readline ext

- Implement FR#53878 Interactive shell should work with shared readline extension

# This is useful w/ distributors who like to build all things shared or don't
# provide the readline extension. Or if a user pefers readline's behavior over
# libedit which might be used by the distributor.

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- Fixed bug #50209 (Compiling with libedit cannot find readline.h)
(patch by tcallawa at redhat dot com)

- Fixed bug #48608 (Invalid libreadline version not detected during configure)

- Fixed bBug #48873 (Using both --with-libedit and --with-readline cause unknown option warning)

# This isn't worth of NEWS entry, it's just cosmetic

- Fixed bug #48256 (Crash due to double-linking of history.o)

fix build with libedit

- Fixed bug #35409 (undefined reference to 'rl_completion_matches')

MFB51: fix build when --with-libedit is used

- Unify the "configure --help" texts

Update extensions to use /path/to/$PHP_LIBDIR rather than /path/to/lib
to support multi-ABI platforms.

Add support for the readline callback interface, allowing you to interleave
IO and user input. Sample script:

<?php
dl("readline.so");

function handle_user_input($line)

Add support for the readline callback interface, allowing you to interleave
IO and user input. Sample script:

<?php
dl("readline.so");

function handle_user_input($line)
{
echo "You typed: '$line'\n";
if ($line == 'exit')
exit;
}

readline_callback_handler_install('type! > ', 'handle_user_input');

while (true) {
$n = stream_select($r = array(STDIN), $w = null, $e = null, null);

if ($n && in_array(STDIN, $r)) {
readline_callback_read_char();
}
}

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- No tabs here please

use dependent libs while probing for functions