www/py-aioh2: Fix build with Python 3.7+

www/py-aioh2/Makefile

@@ -12,7 +12,7 @@ COMMENT=	HTTP/2 implementation with hyper-h2 on Python 3 asyncio
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}h2>=3:www/py-h2@${PY_FLAVOR} \
+xRUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}h2>=3:www/py-h2@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}priority>=1.3.0:www/py-priority@${PY_FLAVOR}
 
 USES=		python:3.4+

www/py-aioh2/files/patch-aioh2-helper.py

@@ -0,0 +1,8 @@
+--- aioh2/helper.py.orig	2018-02-05 02:31:19 UTC
++++ aioh2/helper.py
+@@ -86,4 +86,4 @@ if hasattr(socket, 'AF_UNIX'):
+ if hasattr(asyncio, 'ensure_future'):  # Python >= 3.5
+     async_task = asyncio.ensure_future
+ else:
+-    async_task = asyncio.async
++    async_task = getattr(asyncio, "async")

www/py-aioh2/files/patch-aioh2-protocol.py

@@ -0,0 +1,11 @@
+--- aioh2/protocol.py.orig	2017-12-03 09:08:55 UTC
++++ aioh2/protocol.py
+@@ -380,7 +380,7 @@ class H2Protocol(asyncio.Protocol):
+         if self._handler:
+             raise Exception('Handler was already set')
+         if handler:
+-            self._handler = asyncio.async(handler, loop=self._loop)
++            self._handler = async_task(handler, loop=self._loop)
+
+     def close_connection(self):
+         self._transport.close()