[5.15/6.1->6.2] Some library names now have a "Private" suffix

Compared from 6.1 and 6.2, following library names now have "Private" suffixes:

• Qt6DesignerComponents.dll -> Qt6DesignerComponentsPrivate.dll
• Qt6Bodymovie.dll -> Qt6BodymovinPrivate.dll
• Qt6QuickShapes.dll -> Qt6QuickShapesPrivate.dll
• Qt6QuickParticles.dll -> Qt6QuickParticlesPrivate.dll
• Qt6QmlDom.lib -> Qt6QmlDomPrivate.lib
• Qt6QmlCompiler.lib -> Qt6QmlCompilerPrivate.lib
• Qt6QmlDevTools.lib -> Qt6QmlDevToolsPrivate.lib
• Qt6QmlDebug.lib -> Qt6QmlDebugPrivate.lib
• Qt6PacketProtocol.lib -> Qt6PacketProtocolPrivate.lib
• Qt6AxBase.lib -> Qt6AxBasePrivate.lib
• Qt6FbSupport.lib -> Qt6FbSupportPrivate.lib
• Qt6DeviceDiscoverySupport.lib -> Qt6DeviceDiscoverySupportPrivate.lib

Compared from 5.15 and 6.2, following library names now have "Private" suffixes:

• Qt5MultimediaQuick.dll -> Qt6MultimediaQuickPrivate.dll

The cause is that all internal modules' CMake target names now have "Private" suffixes .  But I don't think Qt should change the library names (especially the DLL names) of existing modules when upgrading from 6.1 to 6.2. I suggest to set the OUTPUT_NAME properties for these modules to avoid the library name changes.