dev-python/autobahn: Fix intermittent ACCESS VIOLATION

A twisted/plugins/ addition was triggerring a twisted cache update.
Causing:
* ACCESS DENIED:  open_wr:
   /usr/lib64/python3.6/site-packages/twisted/plugins/VAd-OChNHI-C28Rfdropin.cache.new

Package-Manager: Portage-2.3.6_p2, Repoman-2.3.2_p70

dev-python/autobahn/autobahn-0.16.0.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2016 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
@@ -55,3 +55,8 @@ S="${WORKDIR}"/${MY_P}
 python_test() {
 	esetup.py test
 }
+
+python_compile() {
+	addpredict "$(python_get_sitedir)"
+	distutils-r1_python_compile
+}

dev-python/autobahn/autobahn-17.5.1.ebuild

@@ -55,3 +55,8 @@ python_test() {
 	cd "${BUILD_DIR}"/lib || die
 	py.test -v || die
 }
+
+python_compile() {
+	addpredict "$(python_get_sitedir)"
+	distutils-r1_python_compile
+}