Merge.hs: treat KEYWORDS="" as missing and default to ~x86 ~amd64

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
ebuild IUSE fixed
add correct flags on ebuild merge
point to own cabal fork
submodule update
submodule update
cabal submodule update
cabal submodule update
Warning-dirven Code-Maid
submoule update: forbid cabal to self update