Issue #16836: Enable IPv6 support even if IPv6 is disabled on the build host.

diff --cc Misc/NEWS
index 4da0b8c7aefc465f6b70e6054727b42c330d63bc,b40d4c7f0513fd634f3f0a421ccbc9e8a6dc9688..2ed6714cf2d5ec6675560a7b7f39db42edb23250
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -601,13 -400,8 +601,15 @@@ Extension Module
  Tests
  -----
  
++- Issue #16836: Enable IPv6 support even if IPv6 is disabled on the build host.
++
  - Issue #16748: test_heapq now works with unittest test discovery.
  
 +- Issue #10646: Tests rearranged for os.samefile/samestat to check for not
 +  just symlinks but also hard links.
 +
 +- Issue #15302: Switch regrtest from using getopt to using argparse.
 +
  - Issue #15324: Fix regrtest parsing of --fromfile, --match, and --randomize
    options.
  

diff --cc configure
Simple merge

diff --cc configure.ac
Simple merge