Fixes:
------

- Fix the problem that console setup accesses shared memory which
  is already unmapped due to race condition. To avoid this issue,
  shared console memory will be kept mapped if it belongs to CTTY.
  Addresses:  https://cygwin.com/pipermail/cygwin/2024-February/255561.html

- Fix a race issue between console open() and close() which is caused
  by state mismatch between con.owner and console attaching state.
  Addresses: https://cygwin.com/pipermail/cygwin/2024-March/255575.html

- Fix a problem that select() call for write-side of a pipe possibly
  hangs with non-cygwin reader.
  Addresses: https://github.com/msys2/msys2-runtime/issues/202