* app/composite/gimp-composite-mmx.c
* app/composite/gimp-composite-sse.c: Replaced all memory
  references in asm() constructs to references to "input" parameters
  to the asm().  This should take care of any name mangling issues
  (see bug #120893)

  Beautified more code to conform to the gimp style guidelines.

  No longer doing pointer math in assembly.  This should ease some
  of the issues of compiling on 64bit machines.

* app/composite/gimp-composite-sse-installer.c
* app/composite/gimp-composite-sse-test.c: Removed reference to
  gimp_composite_overlay_* because this code is suspect.