games-emulation/gens: refactor multilib usage, EAPI 7->8

There is little sense in having a REQUIRED_USE (via MULTILIB_COMPAT)
and MULTILIB_USEDEP for a single choice.

This hidden that this can't be built on amd64 no-multilib by trading
NonSolvableDeps error with RequiredUseDefaults warning (now masked).

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-emulation/gens/gens-2.15.5-r2.ebuild

@@ -1,13 +1,11 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=7
+EAPI=8
 
-MULTILIB_COMPAT=( abi_x86_32 )
+inherit desktop flag-o-matic multilib
 
-inherit desktop flag-o-matic multilib-build
-
-DESCRIPTION="A Sega Genesis/CD/32X emulator"
+DESCRIPTION="Sega Genesis/CD/32X emulator"
 HOMEPAGE="https://sourceforge.net/projects/gens/"
 SRC_URI="mirror://sourceforge/gens/${P}.tar.gz"
 
@@ -16,12 +14,12 @@ SLOT="0"
 KEYWORDS="~amd64 ~x86"
 
 RDEPEND="
-	media-libs/libsdl[${MULTILIB_USEDEP},joystick,video]
-	sys-libs/zlib[${MULTILIB_USEDEP}]
-	virtual/opengl[${MULTILIB_USEDEP}]
-	x11-libs/gtk+:2[${MULTILIB_USEDEP}]"
+	media-libs/libsdl[abi_x86_32(-),joystick,video]
+	sys-libs/zlib:=[abi_x86_32(-)]
+	virtual/opengl[abi_x86_32(-)]
+	x11-libs/gtk+:2[abi_x86_32(-)]"
 DEPEND="${RDEPEND}"
-BDEPEND=">=dev-lang/nasm-0.98"
+BDEPEND="dev-lang/nasm"
 
 PATCHES=(
 	"${FILESDIR}"/${P}-romsdir.patch
@@ -43,8 +41,9 @@ src_configure() {
 
 src_install() {
 	default
+
 	dodoc gens.txt history.txt
 
 	newicon pixmaps/gens_small.png gens.png
-	make_desktop_entry "gens" "Gens"
+	make_desktop_entry gens Gens
 }