RFR: 8304832: [linux] Exception initializing the JavaFX runtime when a security manager is enabled

[Thiago Milczarek Sayao]

#999 changed the way to detect SWT gtk version to read a system property. It was done without the security manger call, causing the issue.

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Commit messages:
 - Fix startup with security manager
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - ... and 26 more: https://git.openjdk.org/jfx/compare/ae2e71fc...da8621ec

Changes: https://git.openjdk.org/jfx/pull/1065/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1065&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304832
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1065.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1065/head:pull/1065

PR: https://git.openjdk.org/jfx/pull/1065