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devtls: reject SHA2_256 mac for SSL, but TLS is fine

sha256 is only defined for TLS1.2, however, technically, theres
no reason not to use it in TLS1.0/TLS1.1. the choice is up to
tlshand and pushtls, not the kernel.

--- a/sys/src/9/port/devtls.c

+++ b/sys/src/9/port/devtls.c

@@ -1421,12 +1421,9 @@

 static void

 initsha2_256key(Hashalg *ha, int version, Secret *s, uchar *p)

 {

+	if(version == SSL3Version)

+		error("sha256 cannot be used with SSL");

 	s->maclen = ha->maclen;

-

-	/* only TLS 1.2 has SHA256. */

-	if(version != TLS12Version)

-		error("sha256 is TLS 1.2 only");

-

 	s->mac = hmac_sha2_256;

 	memmove(s->mackey, p, ha->maclen);

 }