review: correct build.gradle buildVersionFile

[David Hill]

Kevin, Chris,

this seems to fix and issue where version.properties may or may not be in ant-javafx.jar

https://bugs.openjdk.java.net/browse/JDK-8173767
webrev: http://cr.openjdk.java.net/~ddhill/8173767/ <http://cr.openjdk.java.net/%7Eddhill/8173767/>

-- 
David Hill<David.Hill at Oracle.com>
Java Embedded Development

"A man's feet should be planted in his country, but his eyes should survey the world."
-- George Santayana (1863 - 1952)