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vncv: enable connecting to Darwin hosts

Tested on MacOS Catalina and Big Sur releases.

Update man page to highlight weak encryption of vnc, recommending to
tunnel via ssh (thanks unobe).

--- a/sys/man/1/vnc

+++ b/sys/man/1/vnc

@@ -201,9 +201,12 @@

 If the remote frame buffer is larger than the local screen,

 only the upper left corner can be accessed.

 .PP

+.I Vncs

+and

+.I vncv

+encryption is not secure.  It's advisable to tunnel through

+ssh or some other secure protocol.

+.PP

 .I Vncv

 does no verification of the TLS certificate presented

 by the server.

-.PP

-.I Vncv

-supports only version 3.3 of the RFB protocol.

--- a/sys/src/cmd/vnc/auth.c

+++ b/sys/src/cmd/vnc/auth.c

@@ -33,6 +33,8 @@

 		v->vers = 37;

 	else if(strncmp(msg, "RFB 003.008\n", VerLen) == 0)

 		v->vers = 38;

+	else if(strncmp(msg, "RFB 003.889\n", VerLen) == 0)

+		v->vers = 38;  /* Darwin */

 	else /* RFC6143: Any other should be treated as 3.3. */

 		v->vers = 33;