[8u20] Review request: RT-35197: Use Lambda in FX runtime and samples

[Stephen F Northover]

Hi Jim,

Please review the lambdification of the buildSrc component (JSL 
portion).  Strangely, there is only one file that is affected.

Jira: https://javafx-jira.kenai.com/browse/RT-35197
Webrev: See patch in the JIRA

Steve