Update the information on Cygwin.

 GNU C (Cygwin)

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 Cygwin provides a bash shell and GNU tools environment running on

 NT 4.0, Windows 9x and Windows 2000. Consequently, a make of OpenSSL

 with Cygwin is closer to a GNU bash environment such as Linux rather

 than other W32 makes that are based on a single makefile approach.

 Cygwin implements Posix/Unix calls through cygwin1.dll, and is

 contrasted to Mingw32 which links dynamically to msvcrt.dll or

 crtdll.dll.

 Cygwin provides a bash shell and GNU tools environment running

 on NT 4.0, Windows 9x, Windows ME, Windows 2000, and Windows XP.

 Consequently, a make of OpenSSL with Cygwin is closer to a GNU

 bash environment such as Linux than to other W32 makes which are

 based on a single makefile approach. Cygwin implements Posix/Unix

 calls through cygwin1.dll, and is contrasted to Mingw32 which links

 dynamically to msvcrt.dll or crtdll.dll.

 To build OpenSSL using Cygwin:

 * Install Cygwin (see http://sourceware.cygnus.com/cygwin)

 * Install Cygwin (see http://cygwin.com/)

 * Install Perl and ensure it is in the path (recent Cygwin perl 

   (version 5.6.1-2 of the latter has been reported to work) or

 stripping of carriage returns. To avoid this ensure that a binary

 mount is used, e.g. mount -b c:\somewhere /home.

 As of version 1.1.1 Cygwin is relatively unstable in its handling

 of cr/lf issues. These make procedures succeeded with versions 1.1 and

 the snapshot 20000524 (Slow!).

 "bc" is not provided in the Cygwin distribution.  This causes a

 "bc" is not provided in older Cygwin distribution.  This causes a

 non-fatal error in "make test" but is otherwise harmless.  If

 desired, GNU bc can be built with Cygwin without change.

 desired and needed, GNU bc can be built with Cygwin without change.

 Installation