revert ADDR_COMPAT_LAYOUT workaround.

Stop working around bad applications by setting ADDR_COMPAT_LAYOUT.
ADDR_COMPAT_LAYOUT is undesirable because it reduces the amount of
address space available to an application.

The Android emulator, in both 4.3 and 4.4, does not set
ADDR_COMPAT_LAYOUT. Anyone needing to test their application on a
version of Android without ADDR_COMPAT_LAYOUT can use the emulator
and reproduce the failures.

Change-Id: I8f753acc205798bd7f031026c7ece12d26de562c