glibc: fixed to only inject glibc specific config.cache if glibc is the default libc
coreutils: removed glibc specific config cache injection as the same is in the shared glibc config cache

This commit preserves the bug report URL in the comment for reference.
postgresql: marked as being cross-compileable
strace: Updated (4.7 -> 4.8)
musl: fixed findutils by running the musl_fix_gnulib() on the included gnulib sources