cmake: find windeployqt for Windows builds with an installed Qt

WINDEPLOYQT_EXECUTABLE was never set, so the post-build step of the Qt
frontend ran the emulator itself with windeployqt's arguments and failed
every Windows build against an installed Qt, like the release workflow.
Use Qt's own windeployqt target, or look next to Qt's binaries, and name
the executable through the target instead of a hard-coded file name.

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