Add possibility for miniz to use an external crc definition. (#27558)
Summary:
We add an #ifdef check for USE_EXTERNAL_MZCRC, in which case miniz
will look for an external mz_crc32 definition. The default behavior
is unchanged.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27558
Test Plan: Unchanged default behavior, but buck test caffe2/test/...
Differential Revision: D17814440
Pulled By: jjlilley
fbshipit-source-id: e4ecbe37ee2f9eec176093372f21b3b8e52a5f81
