Revert^2 "Switch from version script to APEX stubs for libdexfile_external and...

Revert^2 "Switch from version script to APEX stubs for libdexfile_external and add it to the Runtime APEX."

This reverts commit 7e7ab23b.

Reason for revert: Another try with http://r.android.com/892234 in place.

Test: m checkbuild dist
Test: m
Test: m oatdumps
Test: Flash and boot
Test: art/build/apex/runtests.sh
Bug: 119632407
Bug: 120670568
Bug: 122885634
Change-Id: I037d8b5ebae4ba1c0b84d3ac2ac396f6065407a7