Code "vendored" from:

  - https://github.com/luxengine/math
    commit c1c24bddca65e885c42705959b20eff9885d7c13

  - https://github.com/luxengine/glm
    commit 71ff5d93b998546824755202fc866c8b5edd65ed

Code "vendored" from luxengine

  - https://github.com/luxengine/lux/math
    commit c1c24bddca65e885c42705959b20eff9885d7c13

  - https://github.com/luxengine/lux/glm
    commit fa8068e19c14235556c6b435341d96c6a3300a2d

Update the references to lux engine
math: Update the references to lux engine

luxengine has moved the math and glm code into one repository, update
the references to those libraries.

Signed-off-by: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@gmail.com>
