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ndb/dns: reduce sencodefmt() to not link in enc32()/enc64() encoders

the special sencodefmt() in ndb/dn.c is only used with %H format for
hexadecimal printing for binary strings. removing the unused
calls to enc32() and enc64() reduces the code size by arround 4K.
(this is usefull for ndb/getip which gets linked into the kernel).

--- a/sys/src/cmd/ndb/dn.c

+++ b/sys/src/cmd/ndb/dn.c

@@ -1713,20 +1713,7 @@

 	ilen = f->prec;

 	f->prec = 0;

 	f->flags &= ~FmtPrec;

-	switch(f->r){

-	case '<':

-		len = (8*ilen+4)/5 + 3;

-		break;

-	case '[':

-		len = (8*ilen+5)/6 + 4;

-		break;

-	case 'H':

-		len = 2*ilen + 1;

-		break;

-	default:

-		goto error;

-	}

-

+	len = 2*ilen + 1;

 	if(len > sizeof(obuf)){

 		buf = malloc(len);

 		if(buf == nil)

@@ -1736,20 +1723,7 @@

 	/* convert */

 	out = buf;

-	switch(f->r){

-	case '<':

-		rv = enc32(out, len, b, ilen);

-		break;

-	case '[':

-		rv = enc64(out, len, b, ilen);

-		break;

-	case 'H':

-		rv = enc16(out, len, b, ilen);

-		break;

-	default:

-		rv = -1;

-		break;

-	}

+	rv = enc16(out, len, b, ilen);

 	if(rv < 0)

 		goto error;