tools: require automake version 1.14 or higher

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 60c952b9bb77a19beb4efa28d5693cf6e18db257)
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

extras/tools/bootstrap

@@ -71,7 +71,7 @@ fi
 }
 
 check autoconf 2.69
-check automake 1.11
+check automake 1.14
 check m4 1.4.16
 check libtool 2.4
 check pkg-config