Leave printf format parsing to glibc if possible.

Call glibc's parse_printf_format() to gather information about
argument types.  This automatically handles positional parameters and
user-defined printf formats for ordinary parameter types; it doesn't
handle user-defined printf parameter types (such as defined by libdfp
for decimal floating-point).

Also add a (non-comprehensive) test.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>
Signed-off-by: Gergely Nagy <algernon@balabit.hu>

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