[OpenJDK 2D-Dev] RFR: 8240342: Custom composite is ignored when printing an opaque image to a page

[Philip Race]

bug: https://bugs.openjdk.java.net/browse/JDK-8240342
webrev : http://cr.openjdk.java.net/~prr/8240342/

The code that determines if we could print an image via platform APIs
was not checking for custom composites.

The fix is in code used on Linux/Solaris and Windows only.
The Mac printing path is quite different and was not affected.

-phil.