Use -lpthread

Author: Cuda-Chen

Makefile

@@ -71,7 +71,7 @@ ifeq ($(call has, VIRTIOSND), 1)
     ifeq ($(UNAME_S),Linux)
         LDFLAGS += -lasound -lpthread
     else ifeq ($(UNAME_S),Darwin)
-        LDFLAGS += -framework AudioToolbox -pthread
+        LDFLAGS += -framework AudioToolbox -lpthread
     endif
     CFLAGS += -Icnfa