Log Message:
Add a distfile patch from yours truly, which may become, or may become
part of, a new upstream version, but I need to talk to some people first.
(I'm keeping this separate from the previous update in case it breaks stuff.)

Changes:
	roll in parts of patch-aa and patch-aq;
	roll in all of patch-ar and patch-src_memsize_c;
	make the ARM-only adjustment from patch-ar universal;
	add enough volatile to make 'mhz' work more or less properly again;
	fix the loop calibration to bail out instead of spinning forever
	  if things go too fast (e.g. because the compiler's optimized out
	  the benchmark loop);
	various hacking and modernization to get sort of a clean compile;
	fix some non-stdc stringifying macros;
	hopefully advance the clang build a bit further.