[OpenJDK 2D-Dev] RFR: 8165345: JDK macro definition re-defined by MacOS core framework

[Philip Race]

Bug: https://bugs.openjdk.java.net/browse/JDK-8165345
Webrev: http://cr.openjdk.java.net/~prr/8165345/

MacOS has its own definition of FloatToFixed, so changing the name of 
the JDK one.
More details in the bug.

-phil.