Make libxml2 a required build dependency.
authorBen Pfaff <blp@cs.stanford.edu>
Mon, 30 Apr 2018 00:15:54 +0000 (17:15 -0700)
committerBen Pfaff <blp@cs.stanford.edu>
Mon, 30 Apr 2018 00:25:22 +0000 (17:25 -0700)
This makes the logic for what is required versus optional much simpler.  An
upcoming commit will introduce a new libxml2 user.


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