Fix definition of POSIX data types

Commit 92f558482d added stdint.h to get
the type definitions, but included it after the first use of int8_t in
builds for Windows.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

rfb/rfbproto.h

@@ -60,6 +60,7 @@
  *      messages have to be explained by comments.
  */
 
+#include <stdint.h>
 
 #if defined(WIN32) && !defined(__MINGW32__)
 #define LIBVNCSERVER_WORDS_BIGENDIAN
@@ -108,8 +109,6 @@ typedef int8_t rfbBool;
 #define TRUE -1
 #endif
 
-#include <stdint.h>
-
 typedef uint32_t rfbKeySym;
 typedef uint32_t rfbPixel;