libc: remove unneeded glibc/eglibc common functions

do_libc_locales_extract() and do_libc_locales() in glibc-eglibc.sh-common have
been overridden for both glibc and eglibc, so they can now be removed, which
this patch does.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>

 reporter_name="Ioannis E. Venetis"

 reporter_url="http://sourceware.org/ml/crossgcc/2011-05/msg00005.html"

 reporter_comment=""