Revert "Generate the NDK docs with the ndk-docs target."

This reverts commit d51b6d0d75adff6de4e1373f52b1d8aad3c1032c.

Reason for revert: Broke all unbundled builds

Change-Id: Id6722a076ee91ca150b1a53935632579c6f6f6dd
2 files changed