cygwin 3.1.5-1

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

The following packages have been uploaded to the Cygwin distribution:

* cygwin-3.1.5-1
* cygwin-devel-3.1.5-1
* cygwin-doc-3.1.5-1

This is a bugfix release, including a couple of nice to have changes
on top.


What changed:
-------------

- Support WSL symlinks.  Create those by default now.

- FIFOs can now be opened multiple times for reading.


Bug Fixes:
----------

- Fix accidental evaluation of NUL (\0) characters in xterm console output.
  Don't move cursor to the right in case of a NUL character in the console
  output stream, this is not backed by terminfo.
  Addresses: https://cygwin.com/ml/cygwin/2020-02/msg00162.html

- Fix a segfault when starting, e.g., mintty from a bash in a console
  running xterm emulation.
  Addresses: https://cygwin.com/ml/cygwin/2020-02/msg00197.html

- Fix TIOCINQ to always return number of inbound chars if available.
  Addresses: https://cygwin.com/ml/cygwin/2020-02/msg00258.html

- Fix error handling in raw disk writes and allow full disk writes
  including necessary locking on floppies as well.
  Addresses: https://cygwin.com/pipermail/cygwin/2020-April/244610.html

- Fix several FIFO bugs.
  Addresses: https://sourceware.org/pipermail/cygwin/2020-March/000206.html
             https://sourceware.org/pipermail/cygwin/2020-April/244518.html

- Make sure pseudo tty doesn't hang if cygwin-console-helper.exe is
  non-functional.
  Addresses: https://cygwin.com/pipermail/cygwin-patches/2020q2/010191.html

- Fix a bug causing FIFOs to have incorrect permissions.
  Addresses: https://sourceware.org/pipermail/cygwin/2020-May/245031.html