Fix Visual Studio 2015 and later compilation errors due to snprintf macro definition.

Closes swig#1508

Author: wsfulton

CHANGES.current

@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.0.0 (in progress)
 ===========================
 
+2019-04-19: pbecherer
+            [Tcl] Fix Visual Studio 2015 and later compilation errors due to snprintf macro
+            definition.
+
 2019-04-09: wsfulton
             [C#] Fix FxCop warning CA2002 in SWIGPendingException - a lock on a reference of
             type 'Type'.

Lib/chicken/chickenrun.swg

@@ -7,7 +7,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
-#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(_WATCOM)
+#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__BORLANDC__) || defined(_WATCOM)
 # ifndef snprintf
 #  define snprintf _snprintf
 # endif

Lib/swigfragments.swg

@@ -35,7 +35,7 @@
 
 %fragment("<stdio.h>", "header") %{
 #include <stdio.h>
-#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(_WATCOM)
+#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__BORLANDC__) || defined(_WATCOM)
 # ifndef snprintf
 #  define snprintf _snprintf
 # endif