games-roguelike/angband: minor improvements

games-roguelike/angband: minor improvements

- Empty line after EAPI=6.
- Use https.
- Remove unused eutils eclass.
- Sort RDEPEND list.
- Remove a misplaced bracket so that media-libs/sdl-mixer[mp3] is
required only with USE=sound enabled.
- Remove redundant gnome2_icon_savelist call
- Remove obsolete message in pkg_postinst
- Some stylistic changes.

Package-Manager: Portage-2.3.60, Repoman-2.3.12
Signed-off-by: Stefan Strogin <stefan.strogin@gmail.com>
Signed-off-by: James Le Cuirot <chewi@gentoo.org>