small mistake in sftp.c

[Apex Liu]

Hi there,


I can not build libssh on Windows with Visual Studio 2015. There a small 
mistake in sftp.c at line 33:
(in master branch and newest tag: 0.8.2)


...
31  #include <fcntl.h>
32  #include <stdio.h>
33  #include <stdio.h>
34  #include <sys/types.h>
45  #include <sys/stat.h>

...


here, line 33 should be
#include <stdint.h>


That's all, thanks.