Revert "add "Pkgconfig files" section wrt #445130"

This reverts commit b0a519807f82c2190129dfa662922c8b061eb368.
Per 2014-05-13 council decision.

Conflicts:
	ebuild-writing/common-mistakes/text.xml
ebuild-writing/eapi: Replace REPLACED_BY with REPLACED_BY_VERSION
Merge branch 'master' of git+ssh://git.overlays.gentoo.org/proj/devmanual