PARQUET-1098: Install util/comparison.h
PARQUET-1098: Install util/comparison.h

This was breaking third party builds. cc @majetideepak

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #395 from wesm/install-comparison-h and squashes the following commits:

42a48a8 [Wes McKinney] Install util/comparison.h

Change-Id: I8c8c57ba82e9ec2460a88289f9eaafd1613241e9

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