[DRE-maint] Bug#675334: redmine: Upgrade to 1.4.2 fails

[luigifab]

Hello

Same problem (with Lighttpd). I didn't use gem nor bundle as root, only 
aptitude to install redmine.

root at lighttpd:~# ls /usr/share/redmine/vendor/
plugins rails

root at lighttpd:~# ls /usr/share/redmine/vendor/plugins/
acts_as_activity_provider acts_as_searchable classic_pagination 
redmine_apijs
acts_as_attachable acts_as_tree engines redmine_checkout
acts_as_customizable acts_as_versioned gravatar redminelocalavatars
acts_as_event acts_as_watchable open_id_authentication rfpdf
acts_as_list awesome_nested_set prepend_engine_views

root at lighttpd:~# gem list
*** LOCAL GEMS ***