sci-biology/mira-4.0_rc4: Added 4.0_rc4 release candidate. Removing the sed hack redirecting autoconf to config/m4/ instead of m4/ because upstream accepted that source tree layout change in _rc3 already.

Package-Manager: portage-2.2.7
Drop broken old crap

Signed-off-by: Justin Lecher <jlec@gentoo.org>