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TL;DR: Run update_unicode.sh after the publication of a new Unicode
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standard and commit the resulting unicode-widths.h file.
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The long version
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================
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The Git source code ships the file unicode-widths.h which contains
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tables of zero and double width Unicode code points, respectively.
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These tables are generated using update_unicode.sh in this directory.
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update_unicode.sh itself uses a third-party tool, uniset, to query two
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Unicode data files for the interesting code points.
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On first run, update_unicode.sh clones uniset from Github and builds it.
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This requires a current-ish version of autoconf (2.69 works per December
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2016).
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On each run, update_unicode.sh checks whether more recent Unicode data
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files are available from the Unicode consortium, and rebuilds the header
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unicode-widths.h with the new data. The new header can then be
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committed.
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