Merge pull request #292 from marbre/nvidia-cuda-gdk

nvidia-cuda-gdk: Add ~x86 keyword
fixed install location

Package-Manager: portage-2.2.8-r2
Merge branch 'master' of ssh://github.com/gentoo-science/sci
removed www-apps/py-swish-e
drop www-apps/py-swish-e mask
fixed a typo preventing AVX2 support (bug #530454)

Package-Manager: portage-2.2.8-r2
dev-util/nvidia-cuda-gdk: Fix symlink
dev-util/nvidia-cuda-gdk: Remove RESTRICT, add QA_PREBUILT