Core/Threads: Replace Boost TLS with C++11 one (#15782)

* Core/Threads: Replace Boost TLS with C++11 one

Replace boost::thread_specific_ptr<T> thread-local storage with C++11 thread_local to remove libboost_thread dependency from common project

* Fix no-pch build

src/common/Utilities/Random.cpp

@@ -18,23 +18,18 @@
 #include "Random.h"
 #include "Errors.h"
 #include "SFMTRand.h"
-#include <boost/thread/tss.hpp>
+#include <memory>
 #include <random>
 
-static boost::thread_specific_ptr<SFMTRand> sfmtRand;
+static thread_local std::unique_ptr<SFMTRand> sfmtRand;
 static RandomEngine engine;
 
 static SFMTRand* GetRng()
 {
-    SFMTRand* rand = sfmtRand.get();
+    if (!sfmtRand)
+        sfmtRand = std::make_unique<SFMTRand>();
 
-    if (!rand)
+    return sfmtRand.get();
-    {
-        rand = new SFMTRand();
-        sfmtRand.reset(rand);
-    }
-
-    return rand;
 }
 
 int32 irand(int32 min, int32 max)