[gimp] autogen.sh: also look for automake 1.13

[Michael Natterer <mitch src gnome org>]

commit 495b41416b381678bdc94a85e4a89b0a4c970c92
Author: Michael Henning <drawoc darkrefraction com>
Date:   Fri Jan 4 19:48:23 2013 -0500

    autogen.sh: also look for automake 1.13

 autogen.sh |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 01ecc9e..f1483ac 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -157,6 +157,9 @@ echo -n "checking for automake >= $AUTOMAKE_REQUIRED_VERSION ... "
 if ($AUTOMAKE --version) < /dev/null > /dev/null 2>&1; then
    AUTOMAKE=$AUTOMAKE
    ACLOCAL=$ACLOCAL
+elif (automake-1.13 --version) < /dev/null > /dev/null 2>&1; then
+   AUTOMAKE=automake-1.13
+   ACLOCAL=aclocal-1.13
 elif (automake-1.12 --version) < /dev/null > /dev/null 2>&1; then
    AUTOMAKE=automake-1.12
    ACLOCAL=aclocal-1.12