Please review compile warnings from GTK

[David Hill]

Kevin,
   Here is a set of changes to suppress compile warnings in GTK so that we might actually notice a new one

Jira: https://javafx-jira.kenai.com/browse/RT-39208
Webrev: http://cr.openjdk.java.net/~ddhill/RT-39208
**

-- 
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)