eglibc-package.bbclass: Replace hardcoded /lib references

eglibc-package.bbclass: Replace hardcoded /lib references

It turns out that eglibc contains a bunch of hard-coded
references to /lib.  This patch replaces them with the appropriate
${base_libdir}.  Also, the globs in ${libc_baselibs} were a bit too
permissive and would accept, for example, "libc.a" which isn't something
that we want in the main library package. - Phil

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Acked-By: Michael Smith <msmith@cbnco.com>