I've had this patch sitting around since 2016, and just updated it to
apply cleanly. Any objections? Since I killed the stdio UB in this
release cycle I'd like to go ahead and eliminate all the
string-function UB that can be eliminated (there's still aligned read
past end of string that's unfixable without an attribute that
explicitly allows it, or asm; it might turn out that asm would make
sense here).

Rich