giscanner: remove Python xml attribute formatter

There's no sense in keeping it around as it is never
used. And even though measuring the time it takes to
build Gtk-3.0.gir using a) the C version and b) the
Python version reveals there is no measurable difference
to speak of (when *not* running under Python's cProfile
module):

With C collect_attributes:
==========================

real	0m30.614s
real	0m32.255s
real	0m31.034s

With Python collect_attributes:
===============================

real	0m31.530s
real	0m31.549s
real	0m31.673s

The C version ends up using g_markup_escape_text() which
will escape \004 as . Even though this is invalid
xml 1.0 (but valid xml 1.1), the Python version leaves
the \004 as is, which is even less desirable...

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