Revert "Use libdexfile external API in libunwindstack."

This reverts commit 444e23d2.

The rest of the topic doesn't need to be reverted.

Reason for revert: Breaks renderscript on marlin and sailfish.

Test: Manual repro of http://b/121110092#comment1 on reported branch
Test: "atest CtsRenderscriptTestCases" on that branch
Test: mmma system/core/{libunwindstack,libbacktrace}, run host gtests
Test: Make image, flash, and reboot device.
Bug: 121110092, 119632407
Change-Id: If1976b19ce386c95bc5bd4fd6d523745c167de18