GitLab

1. Extract bionic loader tests to static library in
order to link it to bionic cts tests.
2. Make libpagemap dependency static to reduce dependencies
on internal native libraries.

Bug: http://b/22182538
Test: run bionic-unit-tests --gtest_filter=dl*:Dl*
Change-Id: I5decd5893e6338c84b3ab23e1d65d70bd75ad880