roken: posix errnos for windows

Several additional posix errnos are now used within Heimdal.
Add definitions for them.

With the introduction of VS2010 VC errno.h now includes definitions
for the full posix error number list.  Instead of mapping errno values
to Winsock errors, use the new VS2010 assignments.

Change-Id: Ieb7c5efbcbedb1c10d56e5c8a63ddd58a15df9b1

lib/roken/roken.h.in

@@ -79,9 +79,22 @@ typedef SOCKET rk_socket_t;
 
 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL rk_SOCK_IOCTL(SOCKET s, long cmd, int * argp);
 
-#define ETIMEDOUT               WSAETIMEDOUT
-#define EWOULDBLOCK             WSAEWOULDBLOCK
-#define ENOTSOCK		WSAENOTSOCK
+/* Microsoft VC 2010 POSIX definitions */
+#ifndef ENOTSOCK
+#define ENOTSOCK		128
+#endif
+#ifndef ENOTSUP
+#define ENOTSUP                 129
+#endif
+#ifndef EOVERFLOW
+#define EOVERFLOW               132
+#endif
+#ifndef ETIMEDOUT
+#define ETIMEDOUT               138
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK             140
+#endif
 
 #define rk_SOCK_INIT() rk_WSAStartup()
 #define rk_SOCK_EXIT() rk_WSACleanup()