cygwin 3.6.6-1

The following packages have been uploaded to the Cygwin distribution:

* cygwin-3.6.6-1
* cygwin-devel-3.6.6-1
* cygwin-doc-3.6.6-1

Fixes:
------

- Fix the problem that the destructor of dlopen()'ed DLL may be called
  after dlclose(). This fixes the crash on exiting SDL2.
  Addresses: https://cygwin.com/pipermail/cygwin/2025-October/258877.html

- Fix the problem that the constructor of dlopen()'ed DLL may be called
  twice.

- Fix deadlock regarding atexit()'ed function, that waits for another
  thread which calls atexit().
  Addresses: https://cygwin.com/pipermail/cygwin/2025-October/258930.html

- Fix the problem that tmp_pathbuf area is destroyed regarding flock().
  Addresses: https://cygwin.com/pipermail/cygwin/2025-October/258914.html

- Improve newgrp(1) POSIX compatibility and its documentation.
  Addresses: https://cygwin.com/pipermail/cygwin/2025-December/259055.html

- Fix ESC sequence parsing in pty_master_fwd_thread.

- Add a new workaround which prevent the screen from being garbled when
  cmd.exe is started using rlwrap in Win11.

- Fix a bug where app execution aliases no longer start correctly.

- Fix primary group override for non-domain users and users of a
  Microsoft account.
  Addresses: https://cygwin.com/pipermail/cygwin/2025-December/259068.html

- Fix the deadlock between the parent and child processes, where both lock
  the same file and attempt to close it simultaneously.
  Addresses: https://cygwin.com/pipermail/cygwin/2025-December/259187.html

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