fix redefined(_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES) warning

Author: terrycz126

src/lib_json/json_reader.cpp

@@ -33,11 +33,13 @@
 #include <stdio.h>
 
 #if defined(_MSC_VER)
+#if !defined(_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES)
 #define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES 1
+#endif  //_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES
 #if !defined(snprintf)
 #define snprintf _snprintf
-#endif
-#endif
+#endif  //snprintf
+#endif  //_MSC_VER
 #endif
 
 #if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0

src/lib_json/json_writer.cpp

@@ -45,7 +45,9 @@
 #define isfinite _finite
 #endif
 
+#if !defined(_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES)
 #define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES 1
+#endif  //_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES
 #if !defined(snprintf)
 #define snprintf _snprintf
 #endif