ssize_t definition

[Christophe Baribaud <christophe.baribaud@xxxxxxxxx>]

sftp.h defines a nonstandard definition for ssize_t when the compiler is
visual studio
It causes a compiler fatal error when trying to use wxWidgets with libssh
The proposed patch does'nt affect unix nor mingw builds

Attachment: 0003-ssize_t-definition-under-Windows.patch
Description: Binary data