More MMX fixes, including a cludge in the max-length self-test, for MMX
formats that use total_len.
Dynamic: Remove many more of the typecasts, putting them
into anon unions.
listconf.c: Ensure we have a proper version of NSS lib before calling.
bench.c: Get around a crash in VC (and mingw), in -test=0 mode.
These only use clock(), so if the bench is fast, there are 0 clocks used.  I
simply put a 1 in the time slot, if it is 0.