Codechange: remove #ifdef from .cpp files to exclude features

With CMake, these files are simply not compiled to start with.

src/music/dmusic.cpp

@@ -7,8 +7,6 @@
 
 /** @file dmusic.cpp Playing music via DirectMusic. */
 
-#ifdef WIN32_ENABLE_DIRECTMUSIC_SUPPORT
-
 #define INITGUID
 #include "../stdafx.h"
 #ifdef WIN32_LEAN_AND_MEAN
@@ -1241,6 +1239,3 @@ void MusicDriver_DMusic::SetVolume(byte vol)
 {
 	_playback.new_volume = vol;
 }
-
-
-#endif /* WIN32_ENABLE_DIRECTMUSIC_SUPPORT */