simplified definition

Author: TsynkPavel

include/json/version.h

@@ -18,9 +18,7 @@
   ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) |             \
    (JSONCPP_VERSION_PATCH << 8))
 
-#if defined(JSONCPP_USE_SECURE_MEMORY)
-#define JSONCPP_USING_SECURE_MEMORY 1
-#else
+#if !defined(JSONCPP_USE_SECURE_MEMORY)
 #define JSONCPP_USING_SECURE_MEMORY 0
 #endif
 // If non-zero, the library zeroes any memory that it has allocated before