dev-python/astor: enable py3.10, cleanup

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

dev-python/astor/astor-0.8.1.ebuild

@@ -2,9 +2,8 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
-PYTHON_COMPAT=( python3_{8,9} )
-DISTUTILS_USE_SETUPTOOLS=bdepend
 
+PYTHON_COMPAT=( python3_{8..10} )
 inherit distutils-r1
 
 DESCRIPTION="Read/rewrite/write Python ASTs"
@@ -14,13 +13,9 @@ HOMEPAGE="https://pypi.org/project/astor/"
 LICENSE="BSD"
 SLOT="0"
 KEYWORDS="amd64 ~arm ~arm64 ~hppa ~ppc ~ppc64 ~riscv ~sparc x86"
-IUSE=""
 
 distutils_enable_tests pytest
 
-python_prepare_all() {
-	# Tries to roundtrip every package on the system and is unreliable
-	rm -f tests/test_rtrip.py || die
-
-	distutils-r1_python_prepare_all
-}
+EPYTEST_IGNORE=(
+	tests/test_rtrip.py
+)