[8u40] Request to backport 8056122 : Upgrade JDK to use LittleCMS 2.6

[Phil Race]

JDK 9 has been upgraded to Little CMS 2.6.
Since LCMS in JDK 8u was previously identical to that in 9 - modulo a very
tiny number of white-space only differences, I'd like to keep these two 
in sync.
Also I believe 2.6 should resolve some MT issues we've seen.

Since the code was previously identical, it follows that the backport is 
identical

Bug : https://bugs.openjdk.java.net/browse/JDK-8056122

JDK 9 webrev : http://cr.openjdk.java.net/~prr/8056122/
JDK 8u webrev : http://cr.openjdk.java.net/~prr/8056122.8u/

Review thread :
Aug: http://mail.openjdk.java.net/pipermail/2d-dev/2014-August/004775.html
Sep: 
http://mail.openjdk.java.net/pipermail/2d-dev/2014-September/004789.html

-phil.