Almost clean backport to jfx11u (clean except for surrounding context in `build.properties`). 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: - 8264928: Update to Xcode 12.4 Changes: https://git.openjdk.java.net/jfx11u/pull/14/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=14&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8264928 Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.java.net/jfx11u/pull/14.diff Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/14/head:pull/14 PR: https://git.openjdk.java.net/jfx11u/pull/14
