CHROMIUMOS: Compile with -fPIE.

Otherwise the tests fail to build in the chromium-os environment.

BUG=None
TEST='FEATURES=test emerge' on x86-zgb and amd64-corei7
     'emerge' on arm-generic

Change-Id: I24a4ddbfd113609f7fbc185b7660ee3b7387fbbf
1 file changed