RFR: JDK-8210794: Incorrect escaping of $ORIGIN in native test libraries

[Erik Joelsson]

This patch fixes an escaping issue that causes a broken runpath to be 
set in test libraries.

Bug: https://bugs.openjdk.java.net/browse/JDK-8210794

Webrev: http://cr.openjdk.java.net/~erikj/8210794/webrev.01/index.html

/Erik