Cleanup: remove redundant, invalid info from headers

BF-admins agree to remove header information that isn't useful,
to reduce noise.

- BEGIN/END license blocks

  Developers should add non license comments as separate comment blocks.
  No need for separator text.

- Contributors

  This is often invalid, outdated or misleading
  especially when splitting files.

  It's more useful to git-blame to find out who has developed the code.

See P901 for script to perform these edits.

source/gameengine/GameLogic/SCA_RandomNumberGenerator.cpp

@@ -5,7 +5,6 @@
  * Generate random numbers that can be used by other components. We
  * convert to different types/distributions elsewhere. This just
  * delivers a clean, random bitvector.
- *
  */
 
 /* A C-program for MT19937: Real number version                */