Don't use a Twisted version that no longer exist.

net/coherence/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.6 2016/04/17 10:15:21 wiz Exp $
+$NetBSD: distinfo,v 1.7 2020/04/20 00:42:52 joerg Exp $
 
 SHA1 (Coherence-0.6.6.2.tar.gz) = c8f3aedf6f393e400b012b9b79a45faf6bc3c809
 RMD160 (Coherence-0.6.6.2.tar.gz) = f3cea9a846059723c846cb2254aae73ff1a6a5e9
@@ -7,4 +7,4 @@ Size (Coherence-0.6.6.2.tar.gz) = 364908 bytes
 SHA1 (patch-aa) = 3d0e0966a12bb6f42015dac259db085923135fae
 SHA1 (patch-ab) = 54d3ab8e58a4412f4e3b5c263785468f58ac132b
 SHA1 (patch-ac) = c10f363f6de78a9ae4d08956c6d2afa35d817cb4
-SHA1 (patch-coherence_____init____.py) = 2f893049e59af910e9449e7ef081ec05eb1dd3e1
+SHA1 (patch-coherence_____init____.py) = 6e3b8207f26bb8dedd2cd513bd1614b3c31a0c50

net/coherence/patches/patch-coherence_____init____.py

@@ -1,11 +1,21 @@
-$NetBSD: patch-coherence_____init____.py,v 1.1 2016/04/17 10:15:21 wiz Exp $
+$NetBSD: patch-coherence_____init____.py,v 1.2 2020/04/20 00:42:52 joerg Exp $
 
 twisted 16.0.0 detection is broken, see
 https://github.com/coherence-project/Coherence/issues/25
 
 --- coherence/__init__.py.orig	2010-01-02 15:35:20.000000000 +0000
 +++ coherence/__init__.py
-@@ -24,8 +24,6 @@ try:
+@@ -11,8 +11,7 @@ SERVER_ID = ','.join([platform.system(),
+ 
+ 
+ try:
+-    from twisted import version as twisted_version
+-    from twisted.web import version as twisted_web_version
++    from twisted import __version__ as twisted_version
+     from twisted.python.versions import Version
+ except ImportError, exc:
+     # log error to stderr, might be useful for debugging purpose
+@@ -24,8 +23,6 @@ try:
      if twisted_version < Version("twisted", 2, 5, 0):
          raise ImportError("Twisted >= 2.5 is required. Please install it.")