Eric Biggers 83a1bbf1d3 lib: consistently use include guards
A lot of the internal library headers don't have include guards because
they aren't needed.  It might look like a bug, though, and it doesn't
hurt to add them.  So do this.

Update https://github.com/ebiggers/libdeflate/issues/117
2021-03-12 00:07:30 -08:00
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