CRM-14973 - CRM_Core_Menu::buildAdminLinks - Force backend URLs

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* CRM-14973: Administration console does not work in WordPress
  https://issues.civicrm.org/jira/browse/CRM-14973
Merge pull request #4033 from totten/4.4-admin-forcebackend

CRM-14973 - CRM_Core_Menu::buildAdminLinks - Force backend URLs