make sure that the stale header removal works the first time around

sort backwards by ascii, so that the lowercase headers come first -
otherwise the camelcase headers would survive the first round, as they
include the lowercase forwarding headers which were not deleted yet.

Change-Id: Iece2788206d31a11428f38da8d8f9f4d0b6dc992
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

bin/syncqt

@@ -821,7 +821,7 @@ foreach my $lib (@modules_to_sync) {
         my @subdirs = ("$out_basedir/include/$lib");
         foreach my $subdir (@subdirs) {
             if (opendir DIR, $subdir) {
-                foreach my $t (sort readdir(DIR)) {
+                foreach my $t (sort { $b cmp $a } readdir(DIR)) {
                     my $file = "$subdir/$t";
                     if(-d $file) {
                         push @subdirs, $file unless($t eq "." || $t eq "..");