[gimp/gimp-2-8] autogen.sh: also look for automake 1.15

[Michael Schumacher <schumaml src gnome org>]

commit daf10480d57cad7641a3395a2b49acee10335739
Author: su-v <suv-sf users sf net>
Date:   Sat Jan 24 03:22:56 2015 +0100

    autogen.sh: also look for automake 1.15

 autogen.sh |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 7ba766d..59ccd50 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-1.15 --version) < /dev/null > /dev/null 2>&1; then
+   AUTOMAKE=automake-1.15
+   ACLOCAL=aclocal-1.15
 elif (automake-1.14 --version) < /dev/null > /dev/null 2>&1; then
    AUTOMAKE=automake-1.14
    ACLOCAL=aclocal-1.14