Better search for static C library at start of configuration

Until now, to see if a working static C library and `sys/cdefs.h' exist, we
were checking absolute locations like `/usr/include/sys/cdefs.h' or
`/usr/lib/libc.a' and `/usr/lib64/libc.a'. But this is not robust because
on different systems, they can be in different locations.

With this commit, we actually use `find' to find the location of `libc.a'
and use that to add elements to CPPFLAGS and LDFLAGS. This should fix the
problem on systems that have them on non-standard locations.

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