Add support for automake 1.15

This resolves Bug 2403

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit e147134c94)

cvs.sh

@@ -56,7 +56,7 @@ esac
 AUTOMAKE_STRING=`$AUTOMAKE --version | head -n 1`
 required_automake_version="1.6.1 or newer"
 case $AUTOMAKE_STRING in
-  automake*1.6.* | automake*1.7* | automake*1.8* | automake*1.9* | automake*1.10* | automake*1.11* | automake*1.12* | automake*1.13* | automake*1.14* )
+  automake*1.6.* | automake*1.7* | automake*1.8* | automake*1.9* | automake*1.10* | automake*1.11* | automake*1.12* | automake*1.13* | automake*1.14* | automake*1.15* )
     echo "*** $AUTOMAKE_STRING found."
     UNSERMAKE=no
     ;;