[DynInst_API:] [dyninst/dyninst] 447b89: Update cmake setup explanation in README.md

[Xiaozhu Meng]

Branch: refs/heads/master
Home: https://github.com/dyninst/dyninst
Commit: 447b89de3f453e4bb2ef0c2704764665d124f05d
https://github.com/dyninst/dyninst/commit/447b89de3f453e4bb2ef0c2704764665d124f05d
Author: Xiaozhu Meng <***@cs.wisc.edu>
Date: 2018-11-07 (Wed, 07 Nov 2018)

Changed paths:
M README.md

Log Message:
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Update cmake setup explanation in README.md



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