Add attribution and licensing information for "roaring bitmaps" code
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roaring.[ch]: Add attribution and licensing information
OS distributions that take copyright and licensing seriously will tend to become concerned about source files that appear to come from a third party and do not come with copyright/licensing information, and stating that these files are modified is required by clause 4(b) of the Apache license.
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Include a copy of the Apache license
4(a) requires giving recipients of the work a copy of the license, and in any case it's best for source code distributions to be self-contained (including the full text of all applicable licenses).