RFR: 7134690: remove legacy jnilib support from ClassLoader and System [macosx]

[Michael McMahon]

Can I get the following change reviewed please? The change is to remove
some mac specific code from:

src/share/classes/java/lang/System.java and
src/share/classes/java/lang/ClassLoader.java

which added support for non-standard native library suffixes on Mac OS
(ie. .jnilib as well as the standard .dylib).

We would like to remove this code, so there will be no changes to those 
sources
when the Mac changes get pushed to jdk7u-dev

I have submitted a hotspot CR to track providing the same functionality
in Mac specific code in hotspot. Though we can probably live without it 
in the short-term.

http://cr.openjdk.java.net/~michaelm/7134690/webrev.1/

Thanks
Michael