remote-mediawiki tests: use a more idiomatic dispatch table

Change the dispatch table code in test-gitmw.pl to use a hash where
subroutine references are the values. This is more obvious than a hash
where the values are strings we'll use to go searching around in the
symbol table for the function.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/mw-to-git/t/test-gitmw.pl

@@ -214,12 +214,12 @@ my $fct_to_call = shift;
 
 wiki_login($wiki_admin, $wiki_admin_pass);
 
-my %functions_to_call = qw(
+my %functions_to_call = (
-	upload_file    wiki_upload_file
+	upload_file    => \&wiki_upload_file,
-	get_page       wiki_getpage
+	get_page       => \&wiki_getpage,
-	delete_page    wiki_delete_page
+	delete_page    => \&wiki_delete_page,
-	edit_page      wiki_editpage
+	edit_page      => \&wiki_editpage,
-	getallpagename wiki_getallpagename
+	getallpagename => \&wiki_getallpagename,
 );
 die "$0 ERROR: wrong argument" unless exists $functions_to_call{$fct_to_call};
-&{$functions_to_call{$fct_to_call}}(@ARGV);
+$functions_to_call{$fct_to_call}->(@ARGV);