.flowconfig M1 hack

Summary: Hack to get flow to run on Apple M1 Macs. Details: https://github.com/facebook/flow/issues/8538

Test Plan: NA

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, subnub

Differential Revision: https://phabricator.ashoat.com/D588