[DGD] Problem and Solution: Cannot compile DGD 1.4.18 on Cygwin/Windows

[Jared Maddox]

Okay, I have a first-try patch for Cygwin support out (technically I
had it last night, but Firefox was being exceptionally slow). The
Github page is here:

https://github.com/jam555/dgd/tree/msys

And you want commit:

0a4b135112f455fe31f2203df4d5a7dc760716f3

It's the commit called "Cygwin detection, attempt 1".

Notes: I actually got a few other commits in before I read Blain's
reply to me. I have some preliminary work in on the precompiler (the
"fluff feature" of naming it from the main makefile, and it should now
build with a .exe suffix on Cygwin & MSys: both untested), and I think
I figured out why some files weren't getting deleted from src/host on
"make clean". The HOST variable wasn't getting propagated in that
case, so the src/host makefile thought it was running on Darwin.