Bugfix/harunspago/55186 fnmatch known bug

[Spago123]

Fixed failling tests in fnmatch.c test file.
Removed duplicated code and added simplicfications.
Added new test cases.

Stepts to test run: west build -p -b qemu_cortex_a53 -t run tests/posix/c_lib_ext/
in the shell and you shall get the next result:
- PASS - [posix_c_lib_ext.test_fnmatch] duration = 0.001 seconds

Fixes #55186

[github-actions]

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[cfriedt]

@Spago123 - really nice, thanks!

Just a couple of housekeeping requests.

I like that you've broken this up into separate commits, but can the commits be redone in this order:

1. Code commit that adds the new functionality ("alpha", etc matching)
2. Add just the tests for "alpha", etc
3. Optimizations to reduce duplicate code, etc
4. Doxygen

Please make sure the commit messages are really clear about what is being done and why in each commit.

[Spago123]

@Spago123 - really nice, thanks!

Just a couple of housekeeping requests.

I like that you've broken this up into separate commits, but can the commits be redone in this order:

1. Code commit that adds the new functionality ("alpha", etc matching)

2. Add just the tests for "alpha", etc

3. Optimizations to reduce duplicate code, etc

4. Doxygen

Please make sure the commit messages are really clear about what is being done and why in each commit.

Yup I reorderd and split the needed commit as you suggested

[cfriedt]

@Spago123 - some CI errors related to islower() and ispunct(), which are often defined as macros.

[Spago123]

@Spago123 - some CI errors related to islower() and ispunct(), which are often defined as macros.

Yup it seems there is an issue with those fucntions on some platforms, I added custom implementations that satistify the library definitions

[sonarqubecloud]

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