dev-python/mypy_extensions: Modernize the ebuild

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/mypy_extensions/mypy_extensions-0.4.3-r1.ebuild

@@ -1,31 +1,25 @@
 # Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=7
-PYTHON_COMPAT=( python3_{7..10} pypy3 )
+EAPI=8
 
+PYTHON_COMPAT=( python3_{8..10} pypy3 )
 inherit distutils-r1
 
 DESCRIPTION="Optional static typing for Python"
-HOMEPAGE="http://www.mypy-lang.org/"
-SRC_URI="https://github.com/python/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
-
-if [[ "${PV}" =~ [9]{4,} ]]; then
-	inherit git-r3
-	EGIT_REPO_URI="https://github.com/python/${PN}"
-	EGIT_COMMIT="master"
-else
-	KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 ~riscv sparc x86 ~x64-macos"
-fi
+HOMEPAGE="
+	http://www.mypy-lang.org/
+	https://github.com/python/mypy_extensions/"
+SRC_URI="
+	https://github.com/python/mypy_extensions/archive/${PV}.tar.gz
+		-> ${P}.tar.gz"
 
 LICENSE="MIT"
 SLOT="0"
-
-IUSE="test"
-RESTRICT="!test? ( test )"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 ~riscv sparc x86 ~x64-macos"
 
 distutils_enable_tests unittest
 
 python_test() {
-	"${PYTHON}" -m unittest discover tests -v || die "tests fail with ${EPYTHON}"
+	eunittest tests
 }