Sanity: Suppress license header check for .qdocconf files.

Change-Id: Icc4dfd681017ff07ab34444004d0259579fe9949
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

git-hooks/sanitize-commit

@@ -505,7 +505,7 @@ while (<DIFF>) {
                 }
                 $size = 0;
                 $new_file = 1;
-                $no_copyright = $issrc;
+                $no_copyright = $issrc && $file !~ /\.qdocconf$/i;
             } elsif ($size > 20000 && !$issrc && !defined($cfg{size})) {
                 my $old_size = 0;
                 for my $old_tree (split(/,/, $old_trees)) {