[PATCH] Add check-symbol-verion.awk

[H.J. Lu]

commit 6deadd4eb6ab4f59d116b2d7ad97be0d0848cb7f
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Oct 8 10:55:05 2025 -0300

didn't remove sysdeps/m68k/m680x0/fpu/w_fmod_compat.c.  As the result,
due to a linker bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=34550

there were 2 default versions of fmod in m68k libm:

   996: 0001433c   174 FUNC    WEAK   DEFAULT   12 fmod@@GLIBC_2.0
   997: 000307d4   214 FUNC    GLOBAL DEFAULT   12 fmod@@GLIBC_2.43

Add check-symbol-verion.awk to verify that versioned symbols only have
one default version in dynamic symbol table.

-- 
H.J.
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