Issue #16698: merge from 3.3

diff --cc Lib/test/test_posix.py
Simple merge

diff --cc Misc/NEWS
index 195b5ace285578b02a94ca3ed62d6527aaa646c4,646d1aece0196304deed5782896055a5cc01f16a..e4184950ba6e5e5829952586581fb80ad83feb29
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -793,9 -574,12 +793,12 @@@ Test
  - Issue #15802: Fix test logic in `TestMaildir.test_create_tmp()`. Patch by
    Serhiy Storchaka.
  
 -- Issue #15557: Add a test suite for the `webbrowser` module, thanks to Anton
 +- Issue #15557: Added a test suite for the webbrowser module, thanks to Anton
    Barkovsky.
  
+ - Issue #16698: Skip posix test_getgroups when built with OS X
+   deployment target prior to 10.6.
+ 
  Build
  -----