Specifies the endian of msvc ARM64 configuration.

Author: gongminmin

include/rapidjson/rapidjson.h

@@ -241,7 +241,7 @@
 #    define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN
 #  elif defined(__i386__) || defined(__alpha__) || defined(__ia64) || defined(__ia64__) || defined(_M_IX86) || defined(_M_IA64) || defined(_M_ALPHA) || defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) || defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || defined(__bfin__)
 #    define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
-#  elif defined(_MSC_VER) && defined(_M_ARM)
+#  elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64))
 #    define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
 #  elif defined(RAPIDJSON_DOXYGEN_RUNNING)
 #    define RAPIDJSON_ENDIAN