RESTRICT AUTOMERGE: Revert "Give full access to system libs from other system libs."

Extending the search path to /system/${LIB} may result in system libs
being loaded in an app classloader namespace. If those libs then depend
on other non-public libraries, e.g. in APEXes, that are only accessible
through links from the system namespace, then those dependencies will
fail to load because the app classloader namespace doesn't have the
same links.

This reverts commit 32aaa89c321a7e51bf97856b935f2dfb4f64399b.

Test: banchan com.google.android.art
      m dist
      adb install out/dist/com.google.android.art.apex
      atest -a libnativeloader_test libnativeloader_lazy_test \
        libnativeloader_e2e_tests
  on a tm-release platform image
Bug: 258340826
Bug: 237577392
Ignore-AOSP-First: Reverting for February train boarding. Revert in
  AOSP still TBD.
Change-Id: I57fee1b208fe56cf6519dd00967d971144a4b33f
14 files changed