Correctly detect address sanitizer with Clang

[zuiderkwast]

Fixes the failure trying to use dlopen with DEEPBIND with ASAN when compiling with Clang:

==90510==You are trying to dlopen a /home/runner/work/valkey/valkey/tests/modules/keyspecs.so shared library with RTLD_DEEPBIND flag which is incompatible with sanitizer runtime (see google/sanitizers#611 for details). If you want to run /home/runner/work/valkey/valkey/tests/modules/keyspecs.so library under sanitizers please remove RTLD_DEEPBIND from dlopen flags.

https://github.com/valkey-io/valkey/actions/runs/13261241213/job/37018133361

The previous check only covers GCC.

Additionally, don't require GLIBC when FreeBSD is used. FreeBSD has it's own libc which supports DEEPBIND according to its docs.

Follow-up of #1703, #1707

[rjd15372]

@zuiderkwast Thanks for fixing this!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.12%. Comparing base (4e0149a) to head (7ed5500).
Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1712      +/-   ##
============================================
+ Coverage     71.11%   71.12%   +0.01%     
============================================
  Files           123      123              
  Lines         65541    65541              
============================================
+ Hits          46610    46619       +9     
+ Misses        18931    18922       -9     

Files with missing lines	Coverage Δ
src/module.c	9.61% <ø> (ø)

... and 14 files with indirect coverage changes