Update olcPGEX_Sound.h

tiansongyu · tiansongyu · commit 8b590249aacb · 2022-01-06T16:09:30.000+08:00
diff --git a/6502/6502Lib/src/public/olcPGEX_Sound.h b/6502/6502Lib/src/public/olcPGEX_Sound.h
@@ -112,6 +112,7 @@
 
 #include <queue>
 #endif
+#include <mutex>
 
 #pragma pack(push, 1)
 typedef struct
