glibc: fix libgcc_s.so
glibc: fix libgcc_s.so

It used to be a symlink, but now it is a link script. It's crucial to get
proper linking, specially on amrv5tel, where libgcc contains lot of code
related to the limited instruction set of the platform.

Without this fix, g++ shared lib linking was broken, because a "-lgcc" was
not propagated wherever "-lgcc_s" was required. The g++ spec only mentions
"-lgcc_s" and the "-lgcc" is introduced with the libgcc_s.so link script,
only available in the glibc path after this fix.

As a reminder, we put libgcc* in the glibc output to avoid having a
runtime dependency on the gcc path only because of the everywhere linked
libgcc. This problem was specially visible in platforms like armv5tel,
where most programs end up linked to libgcc. Platforms with a more rich
instruction set may rarely end up requiring a link to libgcc.

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