[Eugtk-programming] Fix for inspector.gtk

Running on Win2K, I had to make this modification for -makedocs to work 
with packing.exu.

Replace the following (line 36):

    constant HOME		= getenv("HOME")

with

    object HOME
       HOME = getenv("HOME")
    if atom(HOME) then
       HOME = "C:" -- or select the user's current drive?!
    end if

That's just a temporary fix for my system. You will probably want to 
check the variety of drives on the user's system, in case they have 
/gtk2 on their D: or other drive...

I don't know how this will work for Linux/FreeBSD, but it doesn't seem 
like it should break anything.

-=ck