[libsanitizer] Follow-up for r200700: add the new header to CMakeLists.txt and make it empty on non-Mac.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@200701 91177308-0d34-0410-b5e6-96231b3b80d8

Author: ramosian-glider

lib/sanitizer_common/CMakeLists.txt

@@ -56,6 +56,7 @@ set(SANITIZER_HEADERS
   sanitizer_libignore.h
   sanitizer_linux.h
   sanitizer_list.h
+  sanitizer_mac.h
   sanitizer_mutex.h
   sanitizer_placement_new.h
   sanitizer_platform.h

lib/sanitizer_common/sanitizer_mac.h

@@ -13,6 +13,9 @@
 #ifndef SANITIZER_MAC_H
 #define SANITIZER_MAC_H
 
+#include "sanitizer_platform.h"
+#if SANITIZER_MAC
+
 namespace __sanitizer {
 
 enum MacosVersion {
@@ -29,4 +32,5 @@ MacosVersion GetMacosVersion();
 
 }  // namespace __sanitizer
 
+#endif  // SANITIZER_MAC
 #endif  // SANITIZER_MAC_H