Nativeloader: Add minimal effort for host library path

Attempt to (somewhat) support the given library path on a non-Android
device. Iterate through the given list and construct a complete path.
This will of course not handle dependencies correctly and is best
effort.

Required (and enough) for agent-related testing in ART.

Bug: 70901841
Test: m
Change-Id: I9ecb27d662c8a2c79a70b6c5464483c449c5d034