Bump MODULE_VERSION to 5.1.2

Change-Id: Iecde0c3af8be02e73ba993bfb565dbba2a75ffa2
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

.qmake.conf

 load(qt_build_config)
 
-MODULE_VERSION = 5.1.1
+MODULE_VERSION = 5.1.2