[code-reflection] Integrated: Sadly opengl wrap had hardcoded package name this is fixed now

[Gary Frost]

Extracted OpenGL used by wrap_opengl differs between linux anbd mac. We need to 'exclude' one source file when we build each.  
The wrapper code was trying to do this reflectively.  Sadly it had hardcoded expected path for classes to look for. 

This broke when I moved the classes from 'wrap.glwrap' to 'wrap.opengl' to be consistent with other projects. 

This PR fixes this.

This comment is way larger than the fix ;)

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Commit messages:
 - Sadly opengl wrap had hardcoded package name this is fixed now

Changes: https://git.openjdk.org/babylon/pull/482/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=482&range=00
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/482.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/482/head:pull/482

PR: https://git.openjdk.org/babylon/pull/482