[newlib-cygwin] Created tag cygwin-2_8_1-release

[Corinna Vinschen]

The signed tag 'cygwin-2_8_1-release' was created pointing to:

 e4ee6c9... Feature test macros overhaul: unistd.h, part 2

Tagger: Corinna Vinschen <corinna@vinschen.de>
Date: Mon Jul 3 14:02:40 2017 +0200

    Cygwin 2.8.1 release