Moved the CHANGESET define to the top-level Makefile.common since it was being used from there anyway.
Improved the Makefile.dep rules.
Rewrote using intel_syntax.
Got rid of a kludge; I didn't know how to successfully specify a memory reference using Intel syntax so there was one line of AT&T syntax in the file. Now it's all intel_syntax, which is A Good Thing<tm>.