lib.sh: support any command on find_exec()

right now, we assume "find", but it adds any number of
arguments next to that.

change it instead to support any command, where the
assumption is that it would generate a list of files
and directories.

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

include/git.sh

@@ -108,7 +108,7 @@ tmpclone()
 	(
 	[ $# -gt 5 ] || git clone "$repodir" "$3" || err "!clone $repodir $3"
 	git -C "$3" reset --hard "$4" || err "!reset $1 $2 $3 $4 $5"
-	fx_ "eval x_ git -C \"$3\" am" "$5" -type f
+	fx_ "eval x_ git -C \"$3\" am" find "$5" -type f
 	) || repofail="y"
 
 	[ "$repofail" = "y" ] && [ $# -lt 6 ] && tmpclone "$@" retry