Update .gitignore

Add these 3 files to .gitignore:
src/platformsupport/qtplatformsupportversion.h
src/printsupport/qtprintsupportversion.h
src/widgets/qtwidgetsversion.h

Change-Id: Ie13360de9e64e79cb714adba0d2f6e6da0051ae8
Reviewed-on: http://codereview.qt-project.org/5797


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

.gitignore

@@ -127,6 +127,9 @@ src/sql/qtsqlversion.h
 src/testlib/qttestversion.h
 src/xml/qtxmlversion.h
 src/v8/qtv8version.h
+src/platformsupport/qtplatformsupportversion.h
+src/printsupport/qtprintsupportversion.h
+src/widgets/qtwidgetsversion.h
 
 # Test generated files
 QObject.log