lib.sh: remove rmgit()

We don't need to call it from git.sh, because it's
only being done when building a release anyway,
and we already run rmgit when doing a release.

The function itself is only two simple fx_ calls,
so we can just do that from build_release().

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/lib.sh

@@ -29,12 +29,6 @@ mktarball()
 	x_ tar -c "$1" | xz -T$XBMK_THREADS -9e > "$2" || err "mktarball2, $1"
 }
 
-rmgit()
-{
-	fx_ "x_ rm -Rf" x_ find "$1" -name ".git"
-	fx_ "x_ rm -Rf" x_ find "$1" -name ".gitmodules"
-}
-
 e()
 {
 	es_t="e" && [ $# -gt 1 ] && es_t="$2"