Ignore QML cache files

Annoying to see the cache files after running the tests.

Change-Id: I4211547f5b1e88aeb09067957e10f6e0a69dbd00
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

Author: Kari Oikarinen

.gitignore

@@ -271,3 +271,7 @@ wrapper.sh
 wrapper.bat
 *_wrapper.sh
 *_wrapper.bat
+
+# QML cache files
+*.qmlc
+*.jsc