cmake: Windows builds need to link against winmm.

Author: icculus

CMakeLists.txt

@@ -21,6 +21,9 @@ add_library(SDL_native_midi SHARED
 )
 target_include_directories(SDL_native_midi PRIVATE ${SDL3_INCLUDE_DIRS})
 target_link_libraries(SDL_native_midi PRIVATE ${SDL3_LIBRARIES})
+if(WINDOWS)
+    target_link_libraries(SDL_native_midi PRIVATE winmm)
+endif()
 if(APPLE)
     target_link_libraries(SDL_native_midi PRIVATE -Wl,-framework,AudioToolbox -Wl,-framework,AudioUnit -Wl,-framework,CoreServices)
 endif()