Clarify Go copyright license agreement

[Ian Lance Taylor]

Making changes to the Go frontend does not actually require a copyright
assignment to Google.  I misstated this in the README change I committed
yesterday.  It currently requires a copyright license agreement.  I
committed this patch to correct and clarify my wording.

I agree that this situation is less than ideal.  This is the compromise
which the gcc steering committee came up with.  Perhaps we can come up
with something better.  I hope so.

Ian

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