systruss.h replaces the decode table in
usr.bin/truss/syscalls.c. Genereate it here when we generate the other
things. This is the least bad way to go given the current structure of
the code, but if we make makesyscalls.lua a library, we could abstract
this out to only run when we're building truss.
Posted for comments mostly... And I think we'll need to add _Pseudo_Mmapflags type of thing for the ints that are really flags. Ad I'm not sure I like the struct hacks I've done...
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