Finished merge of rt20890 (--enable-epoll & co down)

diff --cc RELNOTES
index c2cb98d62cc4c178c58a7394fc69fc9bd0c67d01,49d152612e437bcb420bbe5313b51388cb46ce1f..e8c440475fc92674b41594fc7222051ddf2092e5
--- 1/RELNOTES
--- 2/RELNOTES
+++ b/RELNOTES
@@@ -66,16 -66,12 +66,22 @@@ by Eric Young (eay@cryptsoft.com)
    for code clarity.
    [ISC-Bugs #42834]
  
 +- Corrected a bug which could cause the server to sporadically crash while
 +  loading lease files with the lease-id-format is set to "hex".  Our thanks
 +  to Jay Ford, University of Iowa for reporting the issue.
 +  [ISC-Bugs #43185]
 +
 +- Pass configure arguments which begin with an upper case letter, e.g.
 +  CFLAGS, to the embedded bind configure, so it is no longer required
 +  to use environment variables to get the same effect.
 +  [ISC-Bugs #35143]
 +
+ - Added --enable-kqueue, --enable-epoll, --enable-devpoll and a more
+   general --with-bind-extra-config to pass extra options to the
+   embedded bind configure. Note we had mixed experiences with this
+   so it is at the user risk, i.e., they are NOT SUPPORTED yet.
+   [ISC-Bugs #20890]
+ 
                        Changes since 4.3.0 (bug fixes)
  
  - Tidy up several small tickets.

diff --cc configure
Simple merge

diff --cc configure.ac
Simple merge