LibraryLookup should lookup libraries in system specific folders

LibraryLookup.ofName looks up a library name in the default system library paths. These paths are hardwired in the hotspot code and typically include just /usr/lib and other few common locations.

The set of paths can be altered by setting the JDK property "java.library.path" - but other frameworks, such as JNR are smarter in this respect, and try to take full advantage of the environment they are executing on (for instance, on Linux, JNR uses `ld` and its cache to locate where libraries are).

To improve usability, it would be great if LibraryLookup could be enhanced in a similar fashion.