ikiwiki-mass-rebuild: Don't trust $! when setting $)

A better fix, just check that what $) returns is what it was asked to set,
and ignore $! entirely.

debian/changelog

@@ -1,7 +1,7 @@
 ikiwiki (2.49) UNRELEASED; urgency=low
 
   * haiku: Generate valid xhtml.
-  * ikiwiki-mass-rebuild: under $! before setting $) to avoid strange errno issue
+  * ikiwiki-mass-rebuild: Don't trust $! when setting $)
 
  -- Joey Hess <joeyh@debian.org>  Fri, 30 May 2008 19:08:54 -0400
 

ikiwiki-mass-rebuild

@@ -34,9 +34,7 @@ sub processline {
 	if (! $pid) {
 		my ($uuid, $ugid) = (getpwnam($user))[2, 3];
 		my $grouplist=join(" ", $ugid, $ugid, supplemental_groups($user));
-		undef $!;
-		$)=$grouplist;
-		if ($!) {
+		if (($)=$grouplist) ne $grouplist) {
 			die "failed to set egid $grouplist: $!";
 		}
 		$(=$ugid;