[frogr] Avoid potential problems by creating m4 dir upfront

[Mario Sanchez Prada <msanchez src gnome org>]

commit 380ccaa5410c0823d04391a6f9a463e7e729d6f5
Author: Mario Sanchez Prada <msanchez igalia com>
Date:   Sat Jul 23 13:03:19 2011 +0200

    Avoid potential problems by creating m4 dir upfront

 autogen.sh |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index bea88c2..b245a17 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 
 set -e
+
+mkdir -p m4
+
 aclocal
 autoconf --force
 autoheader --force