bug#65659: RFC: changing printf(1) behavior on %b

[Phi Debian]

Well after reading yet another thread regarding libc_printf() I got to
admit that even %B is crossed out, (Yet already choosen by ksh93)

The other thread also speak about libc_printf() documentting %# as
undefined for things other than  a, A, e, E, f, F, g, and G, yet the same
thread also talk about a A comming late (citing C99) in the dance, meaning
what is undefined today become defined tomorow, so %#b is no safer.

My guess is that printf(1) is now doomed to follow its route, keep its old
format exception, and then may be implement something like c_printf like
printf but the format string follow libc semantic, or may be a -C option to
printf(1)...

Well in all case %b can not change semantic in the bash script, since it is
there for so long, even if it depart from python, perl, libc, it is
unfortunate but that's the way it is, nobody want a semantic change, and on
next routers update, see the all internet falling appart :-)