Tweak stat.

next_printf() shouldn't return null unless it never found the start of an
escape sequence (it'll return a pointer to the null at the end of the string
otherwise), and the only time we point it at a % and it doesn't is when it's
%%. So handle that before calling. (Also, a single trailing % prints in
other implementations, and while I'm there update to use FLAG() macros,
add a couple comments, and only xflush() once per pattern.)

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