[OpenJDK 2D-Dev] RFR: 8183978 : Remove ICU layout code from OpenJDK

[Phil Race]

Bug: https://bugs.openjdk.java.net/browse/JDK-8183978
Webrev: http://cr.openjdk.java.net/~prr/8183978/

This fix removes the obsolete ICU opentype layout code from JDK 10.

I've built this on all platforms (including open+closed builds).

-phil.