Define __STDC_FORMAT_MACROS when it hasn't been defined to avoid duplicate define error.

sighingnow · sighingnow · commit 6ed6d67c80d6 · 2020-10-22T16:06:55.000+08:00
Signed-off-by: Tao He &lt;linzhu.ht@alibaba-inc.com&gt;
diff --git a/Release/src/json/json_serialization.cpp b/Release/src/json/json_serialization.cpp
@@ -16,7 +16,9 @@
 #include <stdio.h>
 
 #ifndef _WIN32
+#ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
+#endif
 #include <inttypes.h>
 #endif
 
