[newlib-cygwin] Update and sort list of cygwin setup command line options.

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=f4fb7b93ef1bdfee5db11244d55bee400441a1b6 commit f4fb7b93ef1bdfee5db11244d55bee400441a1b6 Author: Jon Turney Date: Fri May 26 12:23:39 2017 +0100 Update and sort list of cygwin setup command line

[newlib-cygwin] Update documentation of cygwin setup proxy configuration details

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=95e66aae3328a9aa2d5d992489228088008dad37 commit 95e66aae3328a9aa2d5d992489228088008dad37 Author: Jon Turney Date: Mon Jun 19 17:18:36 2017 +0100 Update documentation of cygwin setup proxy

[newlib-cygwin] Note regtool fix in release message

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=92fc6ea7e3141291216564dab36677ab56c9a537 commit 92fc6ea7e3141291216564dab36677ab56c9a537 Author: Corinna Vinschen Date: Thu Jun 22 14:48:43 2017 +0200 Note regtool fix in release message