[MERGE #5060 @MSLaguana] Backporting header fix to 1.8

Merge pull request #5060 from MSLaguana:fixMissingHeader

Fixes #5059 in release/1.8

Author: MSLaguana

lib/Jsrt/ChakraCommon.h

@@ -94,6 +94,8 @@ typedef unsigned short WCHAR;
 
 #if (defined(_MSC_VER) && _MSC_VER <= 1900) || (!defined(_MSC_VER) && __cplusplus <= 199711L) // !C++11
 typedef unsigned short uint16_t;
+#else
+#include <stdint.h>
 #endif
 
     /// <summary>