build: Put m4 macros in m4 subdirectory

This silences a warning from libtoolize when running the autogen.sh
script.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/autogen.sh b/autogen.sh
index 904cd67..f83ed27 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -5,6 +5,7 @@ test -z "$srcdir" && srcdir=.
 
 ORIGDIR=`pwd`
 cd $srcdir
+test -d m4 || mkdir m4
 
 autoreconf -v --install || exit 1
 cd $ORIGDIR || exit $?