[lldb] Make TestLoadUsingLazyBind work on linux

and probably other posix oses. Use extra_images to ensure
LD_LIBRARY_PATH is set correctly.

Also take the opportunity to remove hand-rolled library extension
management code in favor of the existing one.

GitOrigin-RevId: bad5ee15ea2e5a5aaaed9c9a5d9982e23cedba55
1 file changed