dev-libs/libinput-1.11.3: fix build with USE=test, other tweaks

dev-libs/libinput-1.11.3: fix build with USE=test, other tweaks

New portage allows USE=test independent of FEATURES=test, so handle
that case - for now by just always telling meson to disable the build
as well, as the deps wouldn't be there.

Make use of meson_use function from meson.eclass.

Remove .la and .a file removing, as meson does not use libtool, nor
does it build static libraries without asking.

Closes: https://bugs.gentoo.org/663342
Package-Manager: Portage-2.3.46, Repoman-2.3.10