srec: build with gcc for now

Summary:
temporary until a few visibility issues are fixed
Depends on D613

Test Plan: verified

Reviewers: randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D654

Change-Id: I667f52612725d5a56c86199f0c3eefc699d5b2b1