android: Import run_pie helper program from Chromium

This allows the position-independent openconnect binary to run on
ICS (4.0) devices.  /system/bin/linker on ICS does not natively support
PIE.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
android: Fix bogus liboath pathname

There is no $(OATH_BUILD)/liboath.la, so the target will get re-run on
every make invocation.  Correct the path so that make skips the completed
OATH dependency.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>