Do not crash on reload.

git-svn-id: http://redmine.rubyforge.org/svn/branches/swistak@1423 e93f8b46-1217-0410-a6f0-8f06a7374b81

extra/svn/Redmine.pm

@@ -96,7 +96,7 @@ And you need to upgrade at least reposman.rb (after r860).
 =cut
 
 use strict;
-use warnings FATAL => 'all';
+use warnings FATAL => 'all', NONFATAL => 'redefine';
 
 use DBI;
 use Digest::SHA1;