tests/common: fix " 37 has function" test on musl systems.

This commit fixes the test that asserts on whether the lchmod() function
should have been detected as available by Meson. It does so by assuming
that on Linux systems not using glibc, the function will be available.

- fix comment about lchmod on Linux: musl has implemented the function
correctly since 2013, so the assumption in the test wasn't correct.
Furthermore, musl doesn't use glibc's stub mechanism.
- fix include to receive __GLIBC__ definition: including almost any
header in glibc will end up defining __GLIBC__, since most headers
include <features.h>. The <gnu/libc-version.h> header was probably
chosen because of its name, but its actual purpose is defining functions
for checking glibc version at runtime (instead of what the binary was
built with), so it isn't necessary to use it. Since it is a completely
non standard header, including it makes the test suite fail on musl due
to not finding the header.

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