Added cygwin version info to cygcheck.cc

[Chris Faylor]

I just checked in a change that adds cygwin version info to cygcheck
output.  When cygcheck finds a DLL named "cygwin1.dll" it attempts to
read version info from the file.  If it fails then nothing is printed.
Otherwise the output looks like this:

 6494k 2000/06/25 f:\cygwin\bin\cygwin1.dll
    Cygwin DLL version info:
        dll major: 1001
        dll minor: 3
        dll epoch: 19
        dll bad signal mask: 19005
        dll old termios: 5
        api major: 0
        api minor: 22
        shared data: 3
        dll identifier: cygwin1
        mount registry: 2
        cygnus registry name: Cygnus Solutions
        cygwin registry name: Cygwin
        program options name: Program Options
        cygwin mount registry name: mounts v2
        build date: Sat Jun 24 20:46:08 EDT 2000
        shared id: cygwin1S3-2000-06-24 20:46

I've also modified cygcheck so that cygwin1.dll info is always printed
last when doing a 'cygcheck -s'.

I'm not 100% satisfied with the way the output looks but I can't think
of anything better than this.  This is just a dumping of the strings
that are in the DLL.

If anyone wants to patch cygcheck.cc to make this more visually
appealing somehow, feel free.

cgf