Summary:
We need cross compiled libraries not just ARM and WASM targets. Going to add those in but want to
prevent taking up too much space by having LLVM built with those targets as well.

Test Plan: Existing.

Reviewers: michelle, vihang, oazizi, #engineering

Reviewed By: vihang, oazizi, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D6684

GitOrigin-RevId: 43ce258954da79b6f02cc7be6a4250b7801f8dbc