update 60fps patch

enhancements/60fps_ex.patch

@@ -1890,10 +1890,19 @@ index 0467495..fa4eb33 100644
  
  using namespace Microsoft::WRL; // For ComPtr
 diff --git a/src/pc/gfx/gfx_sdl2.c b/src/pc/gfx/gfx_sdl2.c
-index a39b76d..3fb1bb1 100644
+index aef2978..ff53b27 100644
 --- a/src/pc/gfx/gfx_sdl2.c
 +++ b/src/pc/gfx/gfx_sdl2.c
-@@ -141,7 +141,7 @@ static inline void gfx_sdl_set_vsync(int mode) {
+@@ -53,7 +53,7 @@ static void (*kb_all_keys_up)(void) = NULL;
+ // whether to use timer for frame control
+ static bool use_timer = true;
+ // time between consequtive game frames
+-static const Uint32 frame_time = 1000 / FRAMERATE;
++static const Uint32 frame_time = 1000 / (2 * FRAMERATE);
+ static Uint32 frame_start = 0;
+ 
+ const SDL_Scancode windows_scancode_table[] = {
+@@ -142,7 +142,7 @@ static inline void gfx_sdl_set_vsync(int mode) {
      if (mode > 1) {
          // try to detect refresh rate
          SDL_GL_SetSwapInterval(1);
@@ -1902,15 +1911,6 @@ index a39b76d..3fb1bb1 100644
          if (vblanks) {
              printf("determined swap interval: %d\n", vblanks);
              SDL_GL_SetSwapInterval(vblanks);
-@@ -225,7 +225,7 @@ static void gfx_sdl_init(const char *window_title) {
-     gfx_sdl_set_fullscreen();
- 
-     qpc_freq = SDL_GetPerformanceFrequency();
--    frame_time = qpc_freq / FRAMERATE;
-+    frame_time = qpc_freq / (2 * FRAMERATE);
- 
-     for (size_t i = 0; i < sizeof(windows_scancode_table) / sizeof(SDL_Scancode); i++) {
-         inverted_scancode_table[windows_scancode_table[i]] = i;
 diff --git a/src/pc/pc_main.c b/src/pc/pc_main.c
 index ed6ee74..63679ad 100644
 --- a/src/pc/pc_main.c