QCoreWLanEngine: Remove OS X 10.6 version

Snow Leopard support is dropped in 5.4.0.

Change-Id: I7f13735fe5dc8ed3051d918feb7b5600a72c3493
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Fix QVariant associative container conversion from built-in types.

Task-number: QTBUG-41403
Change-Id: I9dab0f9450cac11678eb6d20abd2dd08e86e0900
Reviewed-by: Stephen Kelly <steveire@gmail.com>
QStyleSheetStyle: Don't interfere with QFontDialog

The sample lineedit in Qt's own font dialog shouldn't have its font
affected by stylesheets.
Not only does this hampers the ability to preview the font, it actually
overrides the font selection as that one is taken directly from the
widget.

Task-number: QTBUG-41513
Change-Id: I11d0bef8c7bf7bdae4cc08b6b9276d0fc14a75fb
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>