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ndb/dnsquery, ndb/csquery: write ">" prompt to stderr (thanks kvik)

kvik writes:

dnsquery(8) prints the interactive prompt on stdout together with
query results, making scripted usage unnecessarily difficult.

A straightforward solution is prompting on stderr instead: as
practiced by rc(1), among many others -- promptly taking care of
the issue:

	; echo 9front.org mx | ndb/dnsquery >[2]/dev/null

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

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

@@ -68,7 +68,7 @@

 	Binit(&in, 0, OREAD);

 	for(;;){

-		print("> ");

+		fprint(2, "> ");

 		p = Brdline(&in, '\n');

 		if(p == 0)

 			break;

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

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

@@ -58,7 +58,7 @@

 	Biobuf in;

 	Binit(&in, 0, OREAD);

-	for(print("> "); lp = Brdline(&in, '\n'); print("> ")){

+	for(fprint(2, "> "); lp = Brdline(&in, '\n'); fprint(2, "> ")){

 		n = Blinelen(&in) -1;

 		while(isspace(lp[n]))

 			lp[n--] = 0;