Cleanup the xerces-c* mess

xerces-c2 and xerces-c3 were not playing nicely together most of the applications
and are incompatible, all application has been switch to the c3 version


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374571 35697150-7ecd-e111-bb59-0022644237b5
Hook to the build


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374572 35697150-7ecd-e111-bb59-0022644237b5