Don't redefine snprintf() for MSVC 14 in libtiff.

This MSVC version does add snprintf(), finally, and doesn't allow
pre-#defining it before including its stdio.h, so don't do this.

See #16854.

src/tiff/libtiff/tif_config.h

@@ -364,7 +364,10 @@
 /* Set the native cpu bit order */
 #define HOST_FILLORDER FILLORDER_LSB2MSB
 
-#define snprintf _snprintf
+/* MSVC 14 does have snprintf() and doesn't allow defining it */
+#if !defined(_MSC_VER) || _MSC_VER < 1900
+# define snprintf _snprintf
+#endif
 
 /* Define to 1 if your processor stores words with the most significant byte
    first (like Motorola and SPARC, unlike Intel and VAX). */