[RFR][openjfx13] JDK-8214716: Record the versions of tools used to build FX in the repo

[Arunprasad Rajkumar]

Hi,

Please review the following PR which add information about JavaFX dependency 
tools.

https://github.com/javafxports/openjdk-jfx/pull/427 
<https://github.com/javafxports/openjdk-jfx/pull/427>

Thanks,
Arun