Don't print database's tablespace in pg_dump -C --no-tablespaces output.

If the database has a non-default tablespace, we emitted a TABLESPACE
clause in the CREATE DATABASE command emitted by -C, even if
--no-tablespaces was also specified.  This seems wrong, and it's
inconsistent with what pg_dumpall does, so change it.  Per bug #14315
from Danylo Hlynskyi.

Back-patch to 9.5.  The bug is much older, but it'd be a more invasive
change before 9.5 because dumpDatabase() hasn't got an easy way to get
to the outputNoTablespaces flag.  Doesn't seem worth the work given
the lack of previous complaints.

Report: <20160908081953.1402.75347@wrigleys.postgresql.org>

src/bin/pg_dump/pg_dump.c

@@ -2552,7 +2552,8 @@ dumpDatabase(Archive *fout)
 		appendPQExpBufferStr(creaQry, " LC_CTYPE = ");
 		appendStringLiteralAH(creaQry, ctype, fout);
 	}
-	if (strlen(tablespace) > 0 && strcmp(tablespace, "pg_default") != 0)
+	if (strlen(tablespace) > 0 && strcmp(tablespace, "pg_default") != 0 &&
+		!dopt->outputNoTablespaces)
 		appendPQExpBuffer(creaQry, " TABLESPACE = %s",
 						  fmtId(tablespace));
 	appendPQExpBufferStr(creaQry, ";\n");