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win midi: Prevent rare `midiOutUnprepareHeader()` fail (#1564)

Fix by ceski.

--- a/src/i_winmusic.c

+++ b/src/i_winmusic.c

@@ -1460,6 +1460,10 @@

     if (buffer.data)

     {

+        // Windows doesn't always immediately clear the MHDR_INQUEUE flag, even

+        // after midiStreamStop() is called. There doesn't seem to be any side

+        // effect to just forcing the flag off.

+        MidiStreamHdr.dwFlags &= ~MHDR_INQUEUE;

         mmr = midiOutUnprepareHeader((HMIDIOUT)hMidiStream, &MidiStreamHdr,

                                      sizeof(MIDIHDR));

         if (mmr != MMSYSERR_NOERROR)