Add generated assembly files

- These are somewhat outdated: They're used to compare code changes
  between revisions and (really) nothing else
- Committing before moving on to the next thing
Add --with-sdl flag to configure.ac

- Add flag to indicate the presence of SDL (lib and include) to the
  configure script.

  Use:

  ./configure --with-sdl=<path spec>

  ... where <path spec> points to the root of the SDL source directory.
Create stub for wp_graphics

- Add stub for wp_graphics
  - Create wp_graphics_initialize and wp_graphics_terminate functions
  - Include body for header and source

Update build to include new wp_graphics module

- Update configure.ac script
- Add wp_graphics reference to tegen.w
- Update source build Makefile

Add wp_graphics.c and wp_graphics.h to .gitignore

- Don't need these showing up around here

Update assembly sources

- Include new wp_graphics module assembly output