dev-lang/ghc-7.8.1_rc1: fix UNREG -threaded runtime crash

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
projects/blog/97-ghc-7.8.1-rc1-experience.rst: fixed typos

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>