[clang-scan-deps] Include <mutex> in ClangScanDeps.cpp to ensure it

builds on all platforms

llvm-svn: 363208

clang/tools/clang-scan-deps/ClangScanDeps.cpp

@@ -22,6 +22,7 @@
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/Threading.h"
+#include <mutex>
 #include <thread>
 
 using namespace clang;