Podfile and xcodeproj tweaks for M1 iOS Simulator

Test Plan: I don't think these settings should affect Intel Macs.

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, subnub, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D724