media-gfx/nvidia-cg-toolkit: drop unnecessary IUSE=multilib
As nvidia-cg-toolkit has long been migrated to using abi_x86_* to handle
multilib installation, and as there are actually very few things in the
gentoo repo that need this package to be built with +abi_x86_32 on
amd64 multilib systems, this commit drops the multilib flag from IUSE
and removes the default-enabled abi_x86_32 flag from the multilib amd64
profile (which was there to prevent users on multilib profiles from needing
to explicitly add it whenever they just wanted to emerge the package)
Gentoo-Bug: 560868
Package-Manager: portage-2.2.20.1