dev-python/importlib_metadata: Restore dep on setuptools_scm

Closes: https://bugs.gentoo.org/730306
Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/importlib_metadata/importlib_metadata-1.7.0-r1.ebuild

@@ -22,6 +22,7 @@ RDEPEND="
 	$(python_gen_cond_dep 'dev-python/pathlib2[${PYTHON_USEDEP}]' -2)
 "
 BDEPEND="
+	dev-python/setuptools_scm[${PYTHON_USEDEP}]
 	test? (
 		${RDEPEND}
 		$(python_gen_cond_dep '
@@ -38,9 +39,6 @@ distutils_enable_tests unittest
 
 python_prepare_all() {
 	# remove dep on setuptools_scm
-	sed -i -r "s:use_scm_version=.+,:version='${PV}',:" \
-		setup.py || die
-	sed -i -e 's:setuptools-scm::' setup.cfg || die
 	sed -e 's:test_find_local:_&:' \
 		-i importlib_metadata/tests/test_integration.py || die