dev-python/pyenchant: Disable apparently broken self-spelling test

Closes: https://bugs.gentoo.org/731730
Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/pyenchant/pyenchant-3.1.0.ebuild

@@ -25,3 +25,8 @@ BDEPEND="
 	)"
 
 distutils_enable_tests pytest
+
+src_prepare() {
+	rm tests/test_docstrings.py || die
+	distutils-r1_src_prepare
+}