Don't use ADDR_COMPAT_LAYOUT on the emulator

For the emulator, we want people to see memory as it
actually is, not how we're hacking around buggy apps. Don't
set ADDR_COMPAT_LAYOUT on the emulator.

For reasons that I don't understand, personality(ADDR_COMPAT_LAYOUT)
does not persist across an exec on the emulator. app_main gets
into a tight loop restarting itself because of this. This change
also works around that bug.

Change-Id: Ia73a7d2d623c25cf39d248145d97307945d554da