remove time stuff from core

src/app/app_win32.c

@@ -236,6 +236,20 @@ void w32_try_resizing_canvas(w32_canvas_t *canvas, HWND window_handle) {
     }
 }
 
+fn f64 os_seconds_now(void) {
+    static int64_t counts_per_second;
+    if (counts_per_second == 0) {
+        LARGE_INTEGER freq;
+        QueryPerformanceFrequency(&freq);
+        counts_per_second = freq.QuadPart;
+    }
+
+    LARGE_INTEGER time;
+    QueryPerformanceCounter(&time);
+    f64 result = (f64)time.QuadPart / (f64)counts_per_second;
+    return result;
+}
+
 int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
     tcx.temp = ma_create(ma_default_reserve_size);