SCons updates

* Internationalization support is now available on Linux. By default this
  feature is disabled. The reason is that you need to have a precompiled
  version of the ftgl library for your gcc version.
  To enable ftgl support you need to do the following:
  - compile ftgl.
  - set USE_INTERNATIONAL='true' in the config.opts file
  - set the FTGL_INCLUDE and FTGL_LIBPATH to valid locations.
  Freetype2 is detected automatically on your system by using pkg-config.

  There was a problem with linking libraries. I took a look at how the
  Makefile environment did it, and copied the mechanism. Now we're linking:
  freetype, blender_ftf, ftgl and freetype. (Yes, 2x freetype).

* Minor variable cleanup.
  sdl flags are now collected in one Environment() in stead of two. Adapted
  all relevant platform variables accordingly.

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