[rygel] build: Don't mind if m4 dir already exists

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 752798ede414732555c46562506cee52b05def6c
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Thu May 20 18:07:20 2010 +0300

    build: Don't mind if m4 dir already exists

 autogen.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index a015002..cc056c2 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -5,7 +5,7 @@ which gnome-autogen.sh || {
     exit 1
 }
 
-mkdir m4
+mkdir -p m4
 gnome-autogen.sh --enable-vala --enable-maintainer-mode --enable-debug \
                  --enable-test-plugin --enable-mediathek-plugin \
                  --enable-gst-launch-plugin "$@"