add vsync option (#776)

parallel-rdp/interface.hpp

@@ -18,6 +18,7 @@ typedef struct {
   bool PAL;
   bool widescreen;
   bool fullscreen;
+  bool vsync;
   bool integer_scaling;
   uint32_t upscale;
   bool crt;
@@ -37,7 +38,7 @@ typedef struct {
 } CALL_BACK;
 
 void rdp_init(void *_window, GFX_INFO _gfx_info, const void *font,
-              size_t font_size, uint32_t save_state_slot, bool netplay_enabled);
+              size_t font_size, uint32_t save_state_slot);
 void rdp_close();
 void rdp_set_vi_register(uint32_t reg, uint32_t value);
 void rdp_update_screen();