community/qt6-qtbase: fix recursive dependency
Without this patch qt6-qtbase depends on qt6-qtbase-x11 since libQt6EglFsKmsGbmSupport.so (shipped by qt6-qtbase) requires libQt6EglFsKmsSupport.so (shipped by qt6-qtbase-x11).
This commit resolves the recursive dependency by also moving libQt6EglFsKmsGbmSupport.so to the qt6-qtbase-x11 subpackage.
See #13173 (closed)