use two-step casting to silence incompatible function type warning (#249)

Author: bashbaug

loader/windows/icd_windows.c

@@ -281,7 +281,7 @@ BOOL CALLBACK khrIcdOsVendorsEnumerate(PINIT_ONCE InitOnce, PVOID Parameter, PVO
     if (hDXGI)
     {
         IDXGIFactory* pFactory = NULL;
-        PFN_CREATE_DXGI_FACTORY pCreateDXGIFactory = (PFN_CREATE_DXGI_FACTORY)GetProcAddress(hDXGI, "CreateDXGIFactory");
+        PFN_CREATE_DXGI_FACTORY pCreateDXGIFactory = (PFN_CREATE_DXGI_FACTORY)(void*)GetProcAddress(hDXGI, "CreateDXGIFactory");
         if (pCreateDXGIFactory)
         {
             HRESULT hr = pCreateDXGIFactory(&IID_IDXGIFactory, (void **)&pFactory);

loader/windows/icd_windows_apppackage.c

@@ -44,15 +44,15 @@ bool khrIcdOsVendorsEnumerateAppPackage(void)
         return ret;
 
     PFN_GetPackagesByPackageFamily pGetPackagesByPackageFamily =
-        (PFN_GetPackagesByPackageFamily)GetProcAddress(h, "GetPackagesByPackageFamily");
+        (PFN_GetPackagesByPackageFamily)(void*)GetProcAddress(h, "GetPackagesByPackageFamily");
     if (!pGetPackagesByPackageFamily)
     {
         KHR_ICD_TRACE("GetProcAddress failed for GetPackagesByPackageFamily\n");
         goto cleanup;
     }
 
     PFN_GetPackagePathByFullName pGetPackagePathByFullName =
-        (PFN_GetPackagePathByFullName)GetProcAddress(h, "GetPackagePathByFullName");
+        (PFN_GetPackagePathByFullName)(void*)GetProcAddress(h, "GetPackagePathByFullName");
     if (!pGetPackagePathByFullName)
     {
         KHR_ICD_TRACE("GetProcAddress failed for GetPackagePathByFullName\n");

loader/windows/icd_windows_dxgk.c

@@ -46,13 +46,13 @@ bool khrIcdOsVendorsEnumerateDXGK(void)
 
         EnumAdapters.adapter_count = 0;
         EnumAdapters.adapters = NULL;
-        PFN_LoaderEnumAdapters2 pEnumAdapters2 = (PFN_LoaderEnumAdapters2)GetProcAddress(h, "D3DKMTEnumAdapters2");
+        PFN_LoaderEnumAdapters2 pEnumAdapters2 = (PFN_LoaderEnumAdapters2)(void*)GetProcAddress(h, "D3DKMTEnumAdapters2");
         if (!pEnumAdapters2)
         {
             KHR_ICD_TRACE("GetProcAddress failed for D3DKMTEnumAdapters2\n");
             goto out;
         }
-        PFN_LoaderQueryAdapterInfo pQueryAdapterInfo = (PFN_LoaderQueryAdapterInfo)GetProcAddress(h, "D3DKMTQueryAdapterInfo");
+        PFN_LoaderQueryAdapterInfo pQueryAdapterInfo = (PFN_LoaderQueryAdapterInfo)(void*)GetProcAddress(h, "D3DKMTQueryAdapterInfo");
         if (!pQueryAdapterInfo)
         {
             KHR_ICD_TRACE("GetProcAddress failed for D3DKMTQueryAdapterInfo\n");