app-doc/doxygen: Forward-port qconf workaround for portage-multilib users. Add missing patches and drop some unused ones.

(Portage version: 2.2_rc69-r1/hg/Linux x86_64, signed Manifest commit)

app-doc/doxygen: Import app-doc/doxyugen-1.7.1 so that I might forward-port my multilib fixes.

(Portage version: 2.2_rc69-r1/hg/Linux x86_64, signed Manifest commit)

Make sure that eqmake4 is run by the ebuild so that doxygen's Makefiles don't get to call qmake directly. Remove old doxygen versions and patches.
(Portage version: 2.2_rc62-r4/hg/Linux x86_64)
(Unsigned Manifest commit)