glibc-version.inc: remove branch= from GLIBC_GIT_URI

GLIBC_GIT_URI is used along with branch=${SRCBRANCH} so no need to add
it here.

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4c9cfe32)
Signed-off-by: Steve Sakoman <steve@sakoman.com>