portability: introduce LIBSSH2_INT64_T_FORMAT for 64bit printf()s

As pointed out in bug #177, some of the Windows compilers use
%I64 to output 64 bit variables with the printf family.

src/libssh2_priv.h

@@ -1149,4 +1149,11 @@ void _libssh2_init_if_needed (void);
 
 #define ARRAY_SIZE(a) (sizeof ((a)) / sizeof ((a)[0]))
 
+/* define to output the libssh2_int64_t type in a *printf() */
+#if defined( BORLANDC ) || defined( _MSC_VER ) || defined( MINGW32 )
+#define LIBSSH2_INT64_T_FORMAT "I64"
+#else
+#define LIBSSH2_INT64_T_FORMAT "ll"
+#endif
+
 #endif /* LIBSSH2_H */

src/scp.c

@@ -939,7 +939,8 @@ scp_send(LIBSSH2_SESSION * session, const char *path, int mode,
 
         session->scpSend_response_len =
             snprintf((char *) session->scpSend_response,
-                     LIBSSH2_SCP_RESPONSE_BUFLEN, "C0%o %llu %s\n", mode,
+                     LIBSSH2_SCP_RESPONSE_BUFLEN, "C0%o %"
+                     LIBSSH2_INT64_T_FORMAT "u %s\n", mode,
                      size, base);
         _libssh2_debug(session, LIBSSH2_TRACE_SCP, "Sent %s",
                        session->scpSend_response);