Makefile.mingw corrections and made the code pass much stricter checks (now mandated by Makefile.mignw) to ensure GCC 14 readiness.

src/pic.c

@@ -249,7 +249,7 @@ pic_callback(void *priv)
 }
 
 void
-pic_reset()
+pic_reset(void)
 {
     int is_at = IS_AT(machine);
     is_at     = is_at || !strcmp(machine_get_internal_name(), "xi8088");
@@ -709,7 +709,7 @@ pic_irq_ack(void)
 }
 
 int
-picinterrupt()
+picinterrupt(void)
 {
     int i, ret = -1;