fix MSVC warnings

fixes C4191 when compiled with /W3 or above

fix MSVC warnings

sokol_app.h

@@ -5322,15 +5322,15 @@ _SOKOL_PRIVATE void _sapp_wgl_init(void) {
         _sapp_fail("Failed to load opengl32.dll\n");
     }
     SOKOL_ASSERT(_sapp.wgl.opengl32);
-    _sapp.wgl.CreateContext = (PFN_wglCreateContext) GetProcAddress(_sapp.wgl.opengl32, "wglCreateContext");
+    _sapp.wgl.CreateContext = (PFN_wglCreateContext)(void*) GetProcAddress(_sapp.wgl.opengl32, "wglCreateContext");
     SOKOL_ASSERT(_sapp.wgl.CreateContext);
-    _sapp.wgl.DeleteContext = (PFN_wglDeleteContext) GetProcAddress(_sapp.wgl.opengl32, "wglDeleteContext");
+    _sapp.wgl.DeleteContext = (PFN_wglDeleteContext)(void*) GetProcAddress(_sapp.wgl.opengl32, "wglDeleteContext");
     SOKOL_ASSERT(_sapp.wgl.DeleteContext);
-    _sapp.wgl.GetProcAddress = (PFN_wglGetProcAddress) GetProcAddress(_sapp.wgl.opengl32, "wglGetProcAddress");
+    _sapp.wgl.GetProcAddress = (PFN_wglGetProcAddress)(void*) GetProcAddress(_sapp.wgl.opengl32, "wglGetProcAddress");
     SOKOL_ASSERT(_sapp.wgl.GetProcAddress);
-    _sapp.wgl.GetCurrentDC = (PFN_wglGetCurrentDC) GetProcAddress(_sapp.wgl.opengl32, "wglGetCurrentDC");
+    _sapp.wgl.GetCurrentDC = (PFN_wglGetCurrentDC)(void*) GetProcAddress(_sapp.wgl.opengl32, "wglGetCurrentDC");
     SOKOL_ASSERT(_sapp.wgl.GetCurrentDC);
-    _sapp.wgl.MakeCurrent = (PFN_wglMakeCurrent) GetProcAddress(_sapp.wgl.opengl32, "wglMakeCurrent");
+    _sapp.wgl.MakeCurrent = (PFN_wglMakeCurrent)(void*) GetProcAddress(_sapp.wgl.opengl32, "wglMakeCurrent");
     SOKOL_ASSERT(_sapp.wgl.MakeCurrent);
 
     _sapp.wgl.msg_hwnd = CreateWindowExW(WS_EX_OVERLAPPEDWINDOW,
@@ -5421,11 +5421,11 @@ _SOKOL_PRIVATE void _sapp_wgl_load_extensions(void) {
     if (!_sapp.wgl.MakeCurrent(_sapp.wgl.msg_dc, rc)) {
         _sapp_fail("WGL: Failed to make context current\n");
     }
-    _sapp.wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) _sapp.wgl.GetProcAddress("wglGetExtensionsStringEXT");
-    _sapp.wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) _sapp.wgl.GetProcAddress("wglGetExtensionsStringARB");
-    _sapp.wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC) _sapp.wgl.GetProcAddress("wglCreateContextAttribsARB");
-    _sapp.wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) _sapp.wgl.GetProcAddress("wglSwapIntervalEXT");
-    _sapp.wgl.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC) _sapp.wgl.GetProcAddress("wglGetPixelFormatAttribivARB");
+    _sapp.wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)(void*) _sapp.wgl.GetProcAddress("wglGetExtensionsStringEXT");
+    _sapp.wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)(void*) _sapp.wgl.GetProcAddress("wglGetExtensionsStringARB");
+    _sapp.wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)(void*) _sapp.wgl.GetProcAddress("wglCreateContextAttribsARB");
+    _sapp.wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)(void*) _sapp.wgl.GetProcAddress("wglSwapIntervalEXT");
+    _sapp.wgl.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC)(void*) _sapp.wgl.GetProcAddress("wglGetPixelFormatAttribivARB");
     _sapp.wgl.arb_multisample = _sapp_wgl_ext_supported("WGL_ARB_multisample");
     _sapp.wgl.arb_create_context = _sapp_wgl_ext_supported("WGL_ARB_create_context");
     _sapp.wgl.arb_create_context_profile = _sapp_wgl_ext_supported("WGL_ARB_create_context_profile");
@@ -6085,12 +6085,12 @@ _SOKOL_PRIVATE void _sapp_win32_init_dpi(void) {
     GETDPIFORMONITOR_T fn_getdpiformonitor = 0;
     HINSTANCE user32 = LoadLibraryA("user32.dll");
     if (user32) {
-        fn_setprocessdpiaware = (SETPROCESSDPIAWARE_T) GetProcAddress(user32, "SetProcessDPIAware");
+        fn_setprocessdpiaware = (SETPROCESSDPIAWARE_T)(void*) GetProcAddress(user32, "SetProcessDPIAware");
     }
     HINSTANCE shcore = LoadLibraryA("shcore.dll");
     if (shcore) {
-        fn_setprocessdpiawareness = (SETPROCESSDPIAWARENESS_T) GetProcAddress(shcore, "SetProcessDpiAwareness");
-        fn_getdpiformonitor = (GETDPIFORMONITOR_T) GetProcAddress(shcore, "GetDpiForMonitor");
+        fn_setprocessdpiawareness = (SETPROCESSDPIAWARENESS_T)(void*) GetProcAddress(shcore, "SetProcessDpiAwareness");
+        fn_getdpiformonitor = (GETDPIFORMONITOR_T)(void*) GetProcAddress(shcore, "GetDpiForMonitor");
     }
     if (fn_setprocessdpiawareness) {
         /* if the app didn't request HighDPI rendering, let Windows do the upscaling */

sokol_gfx.h

@@ -8004,7 +8004,7 @@ _SOKOL_PRIVATE bool _sg_d3d11_load_d3dcompiler_dll(void) {
                 return false;
             }
             /* look up function pointers */
-            _sg.d3d11.D3DCompile_func = (pD3DCompile) GetProcAddress(_sg.d3d11.d3dcompiler_dll, "D3DCompile");
+            _sg.d3d11.D3DCompile_func = (pD3DCompile)(void*) GetProcAddress(_sg.d3d11.d3dcompiler_dll, "D3DCompile");
             SOKOL_ASSERT(_sg.d3d11.D3DCompile_func);
         }
         return 0 != _sg.d3d11.d3dcompiler_dll;