qmake: Fix generated *_qmlcache.cpp file paths

...for source files that are outside of the source directory.

Having QML files that are generated in the build directory led
to *_qmlcache.cpp files with very long file names, hitting file system
limitations on Windows.

Apply the same fix that was done for generated qmlcache.qrc files in
commit 5d7710a.

Pick-to: 6.2 6.4 6.5
Task-number: QTBUG-108150
Change-Id: Icef9dbf40fc7ade54b584bcdc8799c4cc95ac76d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

tools/qmlcachegen/qtquickcompiler.prf

@@ -77,6 +77,7 @@ for(res, QMLCACHE_RESOURCE_FILES) {
 defineReplace(qmlCacheOutputName) {
     name = $$absolute_path($$1, $$OUT_PWD)
     name = $$relative_path($$name, $$_PRO_FILE_PWD_)
+    contains(name, ^\\.\\..*): name = $$relative_path($$1, $$OUT_PWD)
     name = $$replace(name, \\.qml$, _qml)
     name = $$replace(name, \\.js$, _js)
     name = $$replace(name, \\.mjs$, _mjs)