Fix nojit build

Author: Meghana Gupta

lib/Runtime/Base/ScriptContext.cpp

@@ -42,6 +42,12 @@
 #include "Core/CRC.h"
 #include "Common/CompressionUtilities.h"
 
+#ifdef _M_IX86
+#ifdef _CONTROL_FLOW_GUARD
+extern "C" PVOID __guard_check_icall_fptr;
+#endif
+#endif
+
 namespace Js
 {
     ScriptContext * ScriptContext::New(ThreadContext * threadContext)