Preventive maintenance in advance of pgindent run.

Reformat various places in which pgindent will make a mess, and
fix a few small violations of coding style that I happened to notice
while perusing the diffs from a pgindent dry run.

There is one actual bug fix here: the need-to-enlarge-the-buffer code
path in icu_convert_case was obviously broken.  Perhaps it's unreachable
in our usage?  Or maybe this is just sadly undertested.

src/interfaces/libpq/libpq-int.h

@@ -360,8 +360,8 @@ struct pg_conn
 	char	   *krbsrvname;		/* Kerberos service name */
 #endif
 
-	char	   *target_session_attrs;	/* Type of connection to make
-										 * Possible values any, read-write. */
+	/* Type of connection to make.  Possible values: any, read-write. */
+	char	   *target_session_attrs;
 
 	/* Optional file to write trace info to */
 	FILE	   *Pfdebug;