[Rev 04] RFR: 8246348: Crash in libpango on Ubuntu 20.04 with some unicode chars

[Johan Vos]

> This addresses https://bugs.openjdk.java.net/browse/JDK-8246348

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  use latest patterns in system test
  revert ignored test in :graphics

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/249/files
  - new: https://git.openjdk.java.net/jfx/pull/249/files/8c6e73a0..cc178e77

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/249/webrev.04
 - incr: https://webrevs.openjdk.java.net/jfx/249/webrev.03-04

  Stats: 46 lines in 2 files changed: 2 ins; 37 del; 7 mod
  Patch: https://git.openjdk.java.net/jfx/pull/249.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/249/head:pull/249

PR: https://git.openjdk.java.net/jfx/pull/249