setupegg is broken on windows

[cournape]

setupegg.py uses os.symlink, which is not supported on windows.

A simple solution would be to copy the directory on windows instead of symlinking it. I will prepare a patch for this

[mdboom]

Just a note to self -- setupegg.py is going away in #1454 (since the default build will use distribute), and this fix should be ported there, if applicable.

[mdboom]

With #1454, this shouldn't be necessary at all.

[dmcdougall]

I'll close this as it appears to be resolved by #1454.

@cournape If I have mistakenly closed this and you still see issues even with the new changes brought by #1454, please feel free to reopen this ticket and we can investigate further.