Clean backport to jfx11u. Tested on all three platforms, along with my other in-progress backports, all of which are aggregated in my [`kevinrushforth:test-kcr-11.0.12`](https://github.com/kevinrushforth/jfx11u/commits/test-kcr-11.0.12) branch.
------------- Commit messages: - 8262276: Debug build of WebKit fails Changes: https://git.openjdk.java.net/jfx11u/pull/13/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=13&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8262276 Stats: 34 lines in 6 files changed: 21 ins; 0 del; 13 mod Patch: https://git.openjdk.java.net/jfx11u/pull/13.diff Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/13/head:pull/13 PR: https://git.openjdk.java.net/jfx11u/pull/13
