zlib is required to compress program binaries. It also pulls in the
ndk for cpufeatures. Since the ndk is so large, only pull roll in the
required sub-folders.

BUG=angleproject:4776

Change-Id: I4967a06fd8bfb27040ad0c2f60fec265d555488a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2255507Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>