CMAKE: export PUBLIC headers of OpenAL.

Remove the cmake function:
  INCLUDE_DIRECTORIES(..)
Replace it by:
  TARGET_INCLUDE_DIRECTORIES(...)

It gives us the opportunity to define whether or not OpenAL dependencies
should be exported or not (using PUBLIC or PRIVATE keywoard).

[user visible changes]
The OpenAL PUBLIC headers are exported. When a target depends on OpenAL,
it will have access to its public headers.

Some small refactor along the way.

0 files changed, 0 insertions, 0 deletions