Fix missing mmsystem include

cscd98 · cscd98 · commit 0e3ab058a839 · 2026-01-11T10:45:22.000Z
diff --git a/midi/drivers/winmm_midi.c b/midi/drivers/winmm_midi.c
@@ -14,6 +14,7 @@
  */
 
 #include <windows.h>
+#include <mmsystem.h>
 
 #include <libretro.h>
 #include <lists/string_list.h>
