Fix a few more generator scripts to produce pgindent-clean output.

This completes the project of making all our derived files be
pgindent-clean (or else explicitly excluded from indentation),
so that no surprises result when running pgindent in a built-out
development tree.

Discussion: https://postgr.es/m/79ed5348-be7a-b647-dd40-742207186a22@2ndquadrant.com

src/backend/utils/sort/gen_qsort_tuple.pl

@@ -116,6 +116,7 @@ swapfunc(SortTuple *a, SortTuple *b, size_t n)
 	do
 	{
 		SortTuple	t = *a;
+
 		*a++ = *b;
 		*b++ = t;
 	} while (--n > 0);

src/pl/plpgsql/src/generate-plerrcodes.pl

@@ -34,7 +34,7 @@ while (<$errcodes>)
 	# Skip lines without PL/pgSQL condition names
 	next unless defined($condition_name);
 
-	print "{\n\t\"$condition_name\", $errcode_macro\n},\n\n";
+	print "\n{\n\t\"$condition_name\", $errcode_macro\n},\n";
 }
 
 close $errcodes;

src/pl/plpython/generate-spiexceptions.pl

@@ -37,8 +37,8 @@ while (<$errcodes>)
 	# Change some_error_condition to SomeErrorCondition
 	$condition_name =~ s/([a-z])([^_]*)(?:_|$)/\u$1$2/g;
 
-	print "{ \"spiexceptions.$condition_name\", "
-	  . "\"$condition_name\", $errcode_macro },\n";
+	print "\n{\n\t\"spiexceptions.$condition_name\", "
+	  . "\"$condition_name\", $errcode_macro\n},\n";
 }
 
 close $errcodes;

src/pl/tcl/generate-pltclerrcodes.pl

@@ -34,7 +34,7 @@ while (<$errcodes>)
 	# Skip lines without PL/pgSQL condition names
 	next unless defined($condition_name);
 
-	print "{\n\t\"$condition_name\", $errcode_macro\n},\n\n";
+	print "\n{\n\t\"$condition_name\", $errcode_macro\n},\n";
 }
 
 close $errcodes;