The target test libs are now all built in
nativetest/bionic-loader-test-libs. However, libs built using
libs/Android.build.testlib.mk are still put in lib/ on the host.
This commit refactors libs/Android.build.testlib*.mk so that all test
libs go into nativetest/bionic-loader-test-libs on the host; nothing
changes on the target. Android.build.mk now understands
*_install_to_native_tests_dir both for host and target builds.
Change-Id: I1022e9bab38bf53036c95fd39b3b240bcb31f23a
Move libraries used in bionic-unit-tests out of system partition to
/data/nativetests../bionic-loader-test-libs
Bug: http://b/22182538
Test: build bionic and run bionic-unit-tests
Change-Id: I170177bef782839d0b4970ae4418bf54d0a77836
