Disable serial port if building for Windows

Makefile

@@ -7,7 +7,7 @@ LDFLAGS += `$(SDL2_CONFIG) --libs`
 else
 ifeq ($(TARGET),mingw)
 CC = x86_64-w64-mingw32-gcc
-CFLAGS += -g -Ofast -std=c99 -Wall -Wextra
+CFLAGS += -g -Ofast -std=c99 -Wall -Wextra -DWINDOWS
 LDFLAGS += -lmingw32 -lSDL2main -lSDL2
 TARGET_FILE_EXTENSION = .exe
 else

src/bus.c

@@ -30,10 +30,12 @@ extern mouse_t mouse;
 int bus_io_read(void *user, uint32_t *value, uint32_t port) {
     (void) user;
     switch (port) {
+#ifndef WINDOWS
         case 0x00000000: { // serial port
             *value = serial_get();
             break;
         };
+#endif
 
         case 0x80000000 ... 0x8000031F: { // overlay port
             uint8_t overlay_number = port & 0x000000FF;

src/main.c

@@ -119,7 +119,9 @@ int main(int argc, char *argv[]) {
         ScreenDraw();
     }
 
+#ifndef WINDOWS
     serial_init();
+#endif
 
     tick_start = SDL_GetTicks();
     tick_end = SDL_GetTicks();

src/serial.c

@@ -1,6 +1,7 @@
+#include <stdio.h>
+#ifndef WINDOWS
 #include <sys/select.h>
 #include <unistd.h>
-#include <stdio.h>
 #include <termios.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -50,6 +51,8 @@ int serial_get(void) {
     return 0;
 }
 
+#endif
+
 void serial_put(int value) {
     putchar((int) value);
     fflush(stdout);