RFR: 8254569: Remove hard dependency on Dispman in Monocle fb rendering

Fri Oct 30 20:59:01 UTC 2020

Allow the EGL functionality in monocle to leverage EGL-based systems. The low-level specific details about how the EGL calls should be constructed are left out, and a native interface (egl_ext.h) is created that can be mapped to any low-level system.

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Commit messages:
 - use a default handle if no external library is needed.
 - Add Monocle implementation that works with any EGL-based system

Changes: https://git.openjdk.java.net/jfx/pull/343/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=343&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254569
  Stats: 300 lines in 7 files changed: 296 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jfx/pull/343.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/343/head:pull/343

PR: https://git.openjdk.java.net/jfx/pull/343