Issue #26944: Merge with 3.6.

diff --cc Misc/NEWS
index a46c317d22698cc153f781042460c8268f87931e,04e353c578260563cfaeefce18e61ef781d5a3ef..e525c9bbe352570fd76f249283755964be23c39d
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -326,8 -303,6 +326,11 @@@ Tools/Demo
  Tests
  -----
  
++- Issue #26944: Fix test_posix for Android where 'id -G' is entirely wrong or
++  missing the effective gid.
++
 +- Issue #28409: regrtest: fix the parser of command line arguments.
 +
  - Issue #28217: Adds _testconsole module to test console input.