eglibc: fix packaging of thread_db

eglibc: fix packaging of thread_db

Similarly to libnss*, if ${libdir} and ${base_libdir} were the same path then
libthread_db would land in ${PN}-dev rather than the intended place.  As before,
fix this by moving eglibc-thread-db earlier in PACKAGES and adjusting its FILES
to not capture the .so symlink.

Bump PR for both 2.12 and 2.13.

Signed-off-by: Phil Blundell <philb@gnu.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>