RFR: JDK-8065912 Better handling of classpath in build-infra

Tue Sep 8 18:53:12 UTC 2015

It is tricky to get correct handling on all platforms of class paths 
containing more than one entry. This logic should be encapsulated in a 
global function instead.

A new helper function PathList will format claspaths correctly. A new 
argument CLASSPATH to SetupJavaCompilation will facilitate giving an 
explicit classpath to compilations.

Bug: https://bugs.openjdk.java.net/browse/JDK-8065912
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8065912-better-classpath-handling/webrev.01

/Magnus