Include stdint.h instead of inttypes.h in libmumblelink.c

MSVC 2010 has stdint.h but not inttypes.h.
Debian (GCC, MinGW) and OS X (Clang) can compile using stdint.h.

code/client/libmumblelink.c

@@ -35,7 +35,7 @@
 #endif
 
 #include <fcntl.h>
-#include <inttypes.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>