dev-python/automat: patch out m2r usage

This avoids the hard blocker with m2r (which is now last-rited) which
makes upgrades a lot smoother (no need for manual intervention).

Bug: https://bugs.gentoo.org/847532
Bug: https://bugs.gentoo.org/848900
Signed-off-by: Sam James <sam@gentoo.org>

dev-python/automat/automat-20.2.0-r1.ebuild

@@ -25,12 +25,12 @@ RDEPEND="
 "
 BDEPEND="
 	dev-python/setuptools_scm[${PYTHON_USEDEP}]
-	!!dev-python/m2r
 "
 
 PATCHES=(
 	"${FILESDIR}/test_visualize-twisted-import-errors.patch"
 	"${FILESDIR}/${P}-py311.patch"
+	"${FILESDIR}/${PN}-20.2.0-ignore-m2r.patch"
 )
 
 distutils_enable_tests pytest

dev-python/automat/files/automat-20.2.0-ignore-m2r.patch

@@ -0,0 +1,25 @@
+Completely ignore m2r (which is now last-rited) so we can drop the hard-blocker
+which makes world upgrades a pain (installed m2r would break b/c of newer
+mistune, and would break automat build).
+
+https://github.com/miyakogi/m2r/issues/66
+https://bugs.gentoo.org/848900
+https://bugs.gentoo.org/847532
+--- a/setup.py
++++ b/setup.py
+@@ -4,13 +4,8 @@ Setup file for automat
+ 
+ from setuptools import setup, find_packages
+ 
+-try:
+-    from m2r import parse_from_file
+-    long_description = parse_from_file('README.md')
+-except(IOError, ImportError):
+-    print("\n\n!!! m2r not found, long_description is bad, don't upload this to PyPI !!!\n\n")
+-    import io
+-    long_description = io.open('README.md', encoding="utf-8").read()
++import io
++long_description = io.open('README.md', encoding="utf-8").read()
+ 
+ setup(
+     name='Automat',