[Rubyinstaller-devel] Shared mingw ruby devkit folder

[Gordon Thiesfeld]

Now that I have 5 versions of ruby on my laptop, and 3 of them mingw,
I decided to only have one devkit instead of 3.  I modified the 3
batch files, and copied them in to the bin folders of each version.

I don't have time for a proper writeup right now, but here's more
detail: http://gist.github.com/123684

Once the devkit gem is released, this may be unnecessary, but I
thought someone might find this useful.

Thanks,

Gordon