* lib/stdio/vsscanf.c (vsscanf): Support *, [, s.
* lib/stdio/vfscanf.c (vfscanf): Likewise.
* lib/tests/stdio/90-sscanf.c: Test it.
* build-aux/check-mescc.sh (tests): Run it.
* lib/x86-mes/x86.M1 (mov____%al,0x32(%ebp): New macro.
* lib/stdio/vfprintf.c (vfprintf): Support #-type prefix. Show whole
format upon error.
* lib/stdio/vsnprintf.c (vsnprintf): Likewise.
* lib/stdio/vfscanf.c (vfscanf): Show whole template upon error.
* lib/stdio/vsscanf.c (vsscanf): Likewise.