setup 2.911 release candidate - please test

[Jon Turney]

A new setup release candidate is available at:

   https://cygwin.com/setup/setup-2.911.x86_64.exe (64 bit version)
   https://cygwin.com/setup/setup-2.911.x86.exe    (32 bit version)

Please test, and report any problems here.

This is not the place for setup feature requests.

Changes compared to 2.910:

- Fix a race condition which could corrupt the log, causing setup to 
spin forever at exit.
   Addresses: https://cygwin.com/pipermail/cygwin/2021-November/250084.html

- A few more internal changes to facilitate GUI localization

For instructions on obtaining and building the source code for setup, 
see https://sourceware.org/cygwin-apps/setup.html