Use __func__ in all log messages
Note that android_dlclose does nothing
With NATIVE_TEST=1, libandroid-dl.so is rebuilt with APP_STL=c++_shared
Oops, __func__ is C++ pretty-name on clang; back to __FUNCTION__
Add OpenAbsolutePath and OpenSystemLib
Add extra components to LD_LIBRARY_PATH
Before AndroidDl.initialize, use LD_LIBRARY_PATH directly

Also, fix to use the correct separator (:, not ;).