Fixes
-----
+1) MINOR: d9n't send ext hdr if no exts to discuss
+
+v1.7.3
+======
+
+NB: No API change since v1.7.0
+
+Fixes
+-----
+
1) MAJOR connections on ah waiting list that closed did not get removed from
the waiting list...
3) MAJOR windows-only-POLLHUP was not coming
+4) Fix build on NetBSD
+
v1.7.2
======