Add `dot-a.eclass` and drop USE=static-libs:
We're only building static libs at this point, there's no point in a USE
for the only valid combination. Instead, rely on the default behaviour
and hard-coded `--enable-static` (and upstream behaviour) to ensure that
an appropriate library is built and installed.
Signed-off-by: Matt Jolly <kangie@gentoo.org>
599b18d0d5