scm: mercurial: update test repository for path encoding (#2664).

Mercurial (and also Git) treats file names as byte string.
This mercurial test repository contains Latin-1 encoding path.
Be careful on non Latin-1(CP1252) Windows.

If your Windows is not Latin-1 Windows,
in order to checkout(update) Latin-1 path,
You need to use cygwin 1.7 and set LANG=en_US.ISO-8859-1.

Please refer.
http://mercurial.selenic.com/wiki/EncodingStrategy?action=recall&rev=6

Redmine mercurial adapter do not need to checkout(update) repository.
Mercurial does not have "bare" repository such as Git.
You can use "hg update null" for equivalent "bare" repository.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4996 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/repositories_mercurial_controller_test.rb

@@ -32,7 +32,11 @@ class RepositoriesMercurialControllerTest < ActionController::TestCase
     @request    = ActionController::TestRequest.new
     @response   = ActionController::TestResponse.new
     User.current = nil
-    @repository = Repository::Mercurial.create(:project => Project.find(3), :url => REPOSITORY_PATH)
+    @repository = Repository::Mercurial.create(
+                      :project => Project.find(3),
+                      :url     => REPOSITORY_PATH,
+                      :path_encoding => 'ISO-8859-1'
+                      )
     assert @repository
     @diff_c_support = true
   end