Description:
------------
in ext/mbstring/mbfilter.c, the mbfl_encoding_8bit variable should most likely have a alias for "binary"

im using the mailparse library, and it uses mbstring to decode Content-Transfer-Encoding: binary, and it fails.

i believe binary == 8bit, so the simplest solution is probably to add an alias there.

static const char *mbfl_encoding_8bit_aliases[] = {"binary", NULL};

static const mbfl_encoding mbfl_encoding_8bit = {
        mbfl_no_encoding_8bit,
        "8bit",
        "8bit",
        (const char *(*)[])&mbfl_encoding_8bit_aliases,
        NULL,
        MBFL_ENCTYPE_SBCS
};