[code-reflection] Integrated: Fixes required for maven/cmake on ubuntu - note cuda ptx working, cud…

[Gary Frost]

Changes neeed to build opencl and cuda on ubuntu 

Mostly cmake realted.  CMake creates inconsistent vars for CUDA  include deps, this breaks ffi-backend build  and jextract 

Similarly pom.xml needs a conditional file exclusion for wrapping opengl.

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

Commit messages:
 - Fixes required for maven/cmake on ubuntu - note cuda ptx working, cuda code gen failing

Changes: https://git.openjdk.org/babylon/pull/421/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=421&range=00
  Stats: 21 lines in 4 files changed: 13 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/babylon/pull/421.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/421/head:pull/421

PR: https://git.openjdk.org/babylon/pull/421