python3-gunicorn: add patch work with geventlet

python3-gunicorn depends on python3-geventlet. geventlet has made some
breaking changes (which is part of meta-oe/kirkstone), however gunicorn
wasn't adapted to this, and it broke some features (at least ptests).

This patch backports the change that adapts gunicorn to the used version
of geventlet.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-python/recipes-devtools/python/python3-gunicorn_20.1.0.bb

@@ -9,12 +9,13 @@ inherit pypi setuptools3 ptest
 
 SRC_URI += " \
 	file://run-ptest \
+	file://eventlet-worker-ALREADY_HANDLED-WSGI_LOCAL.patch \
 "
 
 RDEPENDS:${PN}-ptest += " \
     ${PYTHON_PN}-eventlet \
     ${PYTHON_PN}-gevent \
-	${PYTHON_PN}-pytest \
+    ${PYTHON_PN}-pytest \
 "
 
 do_install_ptest() {