MSVC: Use _snprintf instead of snprintf

In Microsoft's Visual C runtime, the snprintf() function is actually
called _snprintf. Let's just #define the former to call the latter.

[JES: fixed commit message]

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

libvncclient/rfbproto.c

@@ -64,6 +64,10 @@
 #include "minilzo.h"
 #include "tls.h"
 
+#ifdef _MSC_VER
+#  define snprintf _snprintf
+#endif
+
 /*
  * rfbClientLog prints a time-stamped message to the log file (stderr).
  */

libvncclient/sockets.c

@@ -57,6 +57,10 @@
 #endif
 #include "tls.h"
 
+#ifdef _MSC_VER
+#  define snprintf _snprintf
+#endif
+
 void PrintInHex(char *buf, int len);
 
 rfbBool errorMessageOnReadFailure = TRUE;

libvncclient/tls_openssl.c

@@ -31,6 +31,10 @@
 
 #include "tls.h"
 
+#ifdef _MSC_VER
+#define snprintf _snprintf
+#endif
+
 static rfbBool rfbTLSInitialized = FALSE;
 static pthread_mutex_t *mutex_buf = NULL;