(format "%d" F) now truncates floating F
Problem reported by Paul Pogonyshev (Bug#31938). * src/editfns.c: Include math.h, for trunc. (styled_format): For %d, truncate floating-point numbers and convert -0 to 0, going back to how Emacs 26 did things. * doc/lispref/strings.texi (Formatting Strings): Document behavior of %o, %d, %x, %X on floating-point numbers. * src/floatfns.c (trunc) [!HAVE_TRUNC]: Rename from emacs_trunc and make it an extern function, so that editfns.c can use it. All callers changed. * test/src/editfns-tests.el (format-%d-float): New test.
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