8u40 post-commit review: RT-39209 deleted dead code associated with obsolete FullCubic shaders

[Jim Graham]

webrev: http://cr.openjdk.java.net/~flar/RT-39209/webrev.00/
Jira: https://javafx-jira.kenai.com/browse/RT-39209

The artifacts directory on Windows was approximately 44k smaller (out of 30m) 
after the code/shaders were removed...

        ...jim