bionic: conditionally revert requirement of PIE binaries

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I847cc4f45f41c8913bcb811bca412fa6d1ca8685
Merge "bionic: conditionally revert requirement of PIE binaries" into android-5.0
Merge remote-tracking branch 'upstream/android-5.0' into android-5.0

Conflicts:
	linker/linker.cpp

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