add includes for _wgetenv

Author: bob80905

lib/DxcSupport/dxcapi.extval.cpp

@@ -4,6 +4,7 @@
 // WinIncludes must come before dxcapi.extval.h
 #include "dxc/Support/Unicode.h" // for wstring conversions like WideToUtf8String
 #include "dxc/Support/dxcapi.extval.h"
+#include <wchar.h> // for _wgetenv
 
 HRESULT DxcDllExtValidationSupport::InitializeInternal(LPCSTR dllName,
                                                        LPCSTR fnName) {

tools/clang/unittests/HLSL/ValidationTest.cpp

@@ -26,6 +26,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Regex.h"
 #include <cstdlib> // for setenv(), getenv(), unsetenv()
+#include <wchar.h> // for _wgetenv
 
 #ifdef _WIN32
 #include <atlbase.h>