#54 Cygwin build support

[Yaakov Selkowitz]

I'm attaching a small patch which enables glabels to
build on Cygwin.

FYI, binary packages are available at:
ftp://sunsite.dk/projects/cygwinports/release/GNOME/glabels/

[Yaakov Selkowitz]

glabels-2.0.3 Cygwin build patch