correct macOS builds

Signed-off-by: Stephen Gutekanst <[email protected]>

Author: Stephen Gutekanst

lib/DxcSupport/WinAdapter.cpp

@@ -21,7 +21,7 @@
 // Mach change start
 // #include "dxc/Support/WinIncludes.h"
 // #ifndef _WIN32
-#if defined(_WIN32) || defined(__clang__)
+#if !defined(_WIN32) || defined(__clang__)
 // Mach change end
 
 #include "dxc/Support/Unicode.h"
@@ -35,7 +35,7 @@ void *CAllocator::Allocate(size_t nBytes) throw() { return malloc(nBytes); }
 void CAllocator::Free(void *p) throw() { free(p); }
 
 // Mach change start
-#ifndef __clang__
+#ifndef _WIN32
 // Mach change end
 //===--------------------------- BSTR Allocation --------------------------===//
 

lib/DxcSupport/WinFunctions.cpp

@@ -14,7 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 // Mach change start
-#ifdef __clang__
+#if defined(__clang__) && defined(_WIN32)
 #include <fcntl.h>
 #include <map>
 #include <string.h>
@@ -32,7 +32,7 @@ HRESULT UInt32Mult(UINT a, UINT b, UINT *out) {
   *out = (uint32_t)result;
   return S_OK;
 }
-#endif
+#endif // defined(__clang__) && defined(_WIN32)
 // Mach change end
 
 #ifndef _WIN32