Successful build of emacs-unicode-2 under Windows with MinGW

[Cheng Gao]

Today I have built emacs-unicode-2 under Windows with MinGW. I had
failed for several times before this.

My aim fot this post is just to let developers know this. Also mean to
give other users confidence to try this branch.

I use a Sept. 9 checkout from cvs repository, not arch inventory.
emacs-unicode-2 source is too slow to checkout.

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