Qt Gui virtualkeyboard plugin was removed in Qt 6.x.
Qt Network Bearer Management was removed in Qt 6.0.
Qt Multimedia mediaservice and audio plugins were removed in Qt 6.x.
CMake 3.25 changed the way PDB generation is handled by only enabling
it for Debug and RelWithDebInfo builds, which prohibits generation of
fully optimized builds with associated symbols (which is MSVC's
default).
If configuring with CMake 3.25 or above, enable this globally for builds
using MSVC and fall back to embedded debug information for anything else
(which would probably be clang-cl).
Generated post build action batch scripts retained an empty token to
the copy command with the used generator expression (as PDBs are only
generated for Debug and RelWithDebInfo configurations).
Moving their copy step into its own command (and using the `true`
CMake command, which is a no-op) ensures that builds in Release and
MinSizeRel correctly finish this step.
