Fix Mac build: Don't use the CFI directives on Mac

Bug: 22414682
Test: testrunner.py --host -t 137

(cherry picked from commit 64ebd81e5cc3f517eaa3a33b6352fa8ae6b36c77)
Merged-In: Ia54fcf012149e1a78a7f2e7c6adb47ba26810cdf
Change-Id: I9118a04fe2b516bcd5131eff7dea1a18491c96eb
1 file changed