glibc: Separate locale files to their own sstate task

glibc: Separate locale files to their own sstate task

Putting the locale and script files into the sysroot for use by their
specific recipes used to be a simple way to share the files. With RSS,
we don't want to copy these into many different recipes so put these
files in their own sstate task.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>