[code-reflection] Integrated: merged changes needed to get opencl + opengl on linux to work

[Gary Frost]

These changes were needed to get HAT and examples/samples to build and run on linux x86 with opencl and opengl

Mostly cmake changes for opengl = cl

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

Commit messages:
 - merged changes needed to get opencl + opengl on linux to work

Changes: https://git.openjdk.org/babylon/pull/412/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=412&range=00
  Stats: 54 lines in 6 files changed: 25 ins; 0 del; 29 mod
  Patch: https://git.openjdk.org/babylon/pull/412.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/412/head:pull/412

PR: https://git.openjdk.org/babylon/pull/412