Use _snprintf for VS versions < 2015.

radixgeo/coordinateconversion.cc

@@ -2,11 +2,13 @@
 #include "radixgeo/coordinateconversion.hh"
 #include "radixmath/constants.hh"
 
-#include <stdio.h>
 #include <algorithm>
 
-// forward declaration of stdio.h function
-int snprintf(char* buf, size_t size, const char* fmt, ...);
+#ifdef _WIN32
+#if _MSC_VER < 1900
+#define snprintf _snprintf
+#endif
+#endif
 
 namespace radix
 {