media-libs/raspberrypi-userland-bin: drop inherit multilib

media-libs/raspberrypi-userland-bin: drop inherit multilib

Apparenly multilib.eclass was used only for get_libdir function, and the
usage was wrong, because it was appended to the package-specific
"/opt/vc/" path which does not need to match system library directory
name.

More than that, the path "/opt/vc/lib" is actually hardcoded in env.d
file installed by this package, so even if get_libdir ever returned
something different than "lib", that would break dynamic linkage of the
installed executables.

Package-Manager: Portage-2.3.66, Repoman-2.3.16
Signed-off-by: Andrey Utkin <andrey_utkin@gentoo.org>