tests: rename tests scripts to the test number

It is hard to name the scripts sensibly. Lots of them are similarly
named and the name did not tell which test that used them.

The

tests: rename tests scripts to the test number

It is hard to name the scripts sensibly. Lots of them are similarly
named and the name did not tell which test that used them.

The new approach is rather to name them based on the test number that
runs them. Also helps us see which scripts are for individual tests
rather than for general test infra.

- badsymbols.pl -> test1167.pl
- check-deprecated.pl -> test1222.pl
- check-translatable-options.pl -> test1544.pl
- disable-scan.pl -> test1165.pl
- error-codes.pl -> test1175.pl
- errorcodes.pl -> test1477.pl
- extern-scan.pl -> test1135.pl
- manpage-scan.pl -> test1139.pl
- manpage-syntax.pl -> test1173.pl
- markdown-uppercase.pl -> test1275.pl
- mem-include-scan.pl -> test1132.pl
- nroff-scan.pl -> test1140.pl
- option-check.pl -> test1276.pl
- options-scan.pl -> test971.pl
- symbol-scan.pl -> test1119.pl
- version-scan.pl -> test1177.pl

Closes #12487

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tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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lib: feature deprecation warnings in gcc >= 4.3

Add a deprecated attribute to functions and enum values that should not
be used anymore.
This uses a gcc 4.3 dialect, thus is only ava

lib: feature deprecation warnings in gcc >= 4.3

Add a deprecated attribute to functions and enum values that should not
be used anymore.
This uses a gcc 4.3 dialect, thus is only available for this version of
gcc and newer. Note that the _Pragma() keyword is introduced by C99, but
is available as part of the gcc dialect even when compiling in C89 mode.

It is still possible to disable deprecation at a calling module compile
time by defining CURL_DISABLE_DEPRECATION.

Gcc type checking macros are made aware of possible deprecations.

Some testing support Perl programs are adapted to the extended
declaration syntax.

Several test and unit test C programs intentionally use deprecated
functions/options and are annotated to not generate a warning.

New test 1222 checks the deprecation status in doc and header files.

Closes #9667

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