Extend Qt.gitignore with qmlcache qrc files (#3322)

Projects using QML files generating a temporary qrc file if a qrc file present in the project.

Qt.gitignore

@@ -50,3 +50,5 @@ compile_commands.json
 
 # QtCreator local machine specific files for imported projects
 *creator.user*
+
+*_qmlcache.qrc