Summary:
X-link: https://github.com/facebookincubator/zstrong/pull/1145
This diff contains a few changes to the xz and libiberty getdeps builds that are required
in order for folly to build as a shared library, which in turn is needed for folly's Python
extensions to build correctly.
Reviewed By: hyuen
Differential Revision: D68252093
fbshipit-source-id: 036bc4a0e7bf9a11f0a4aa6ec0014f7935afbb5b
