Replace placeholder sm66 runtime check (#3497)

Replace the temporary runtime check for SM66 tests with the proper SKD
check

tools/clang/unittests/HLSL/ExecutionTest.cpp

@@ -1198,11 +1198,9 @@ public:
 #endif
   }
 
-  // Replace with appropriate WDK check when available
-#define SM66_RUNTIME_SUPPORT 0
 
   bool DoesDeviceSupportMeshAmpDerivatives(ID3D12Device *pDevice) {
-#if SM66_RUNTIME_SUPPORT
+#if defined(NTDDI_WIN10_FE) && WDK_NTDDI_VERSION >= NTDDI_WIN10_FE
     D3D12_FEATURE_DATA_D3D12_OPTIONS7 O7;
     D3D12_FEATURE_DATA_D3D12_OPTIONS9 O9;
     if (FAILED(pDevice->CheckFeatureSupport((D3D12_FEATURE)D3D12_FEATURE_D3D12_OPTIONS7, &O7, sizeof(O7))) ||
@@ -1217,7 +1215,7 @@ public:
   }
 
   bool DoesDeviceSupportTyped64Atomics(ID3D12Device *pDevice) {
-#if SM66_RUNTIME_SUPPORT
+#if defined(NTDDI_WIN10_FE) && WDK_NTDDI_VERSION >= NTDDI_WIN10_FE
     D3D12_FEATURE_DATA_D3D12_OPTIONS9 O9;
     if (FAILED(pDevice->CheckFeatureSupport((D3D12_FEATURE)D3D12_FEATURE_D3D12_OPTIONS9, &O9, sizeof(O9))))
       return false;
@@ -1229,7 +1227,7 @@ public:
   }
 
   bool DoesDeviceSupportShared64Atomics(ID3D12Device *pDevice) {
-#if SM66_RUNTIME_SUPPORT
+#if defined(NTDDI_WIN10_FE) && WDK_NTDDI_VERSION >= NTDDI_WIN10_FE
     D3D12_FEATURE_DATA_D3D12_OPTIONS9 O9;
     if (FAILED(pDevice->CheckFeatureSupport((D3D12_FEATURE)D3D12_FEATURE_D3D12_OPTIONS9, &O9, sizeof(O9))))
       return false;