update to Pyrex-0.9.3

Enhancements:
	- Types defined with a ctypedef in a 'cdef extern from' block
		are now referred to by the typedef name in generated C code,
		so it is no longer necessary to match the type in the C
		header file exactly.
	- Conversion to/from unsigned long now done with
		PyLong_AsUnsignedLong and PyLong_FromUnsignedLong.
		[Dug Song <dugsong@monkey.org>]
	- A struct, union or enum definition in a 'cdef extern from'
		block may now be left empty (using 'pass'). This can be useful
		if you need to declare a variable of that type, but don't need
		to refer to any of its members.
	- More flexible about ordering of qualifiers such as 'long' and
		'unsigned'.
		["John (J5) Palmieri" <johnp@redhat.com>]
Bug fixes:
	- Non-interned string literals used in a Python class
		definition did not work.
		[Atsuo Ishimoto <ishimoto@gembook.org>]
		[Andreas Kostyrka <andreas@kostyrka.org>]
	- Return types of the buffer interface functions for extension
		types have been corrected.
		[Dug Song <dugsong@monkey.org>]
	- Added 'static' to declarations of string literals.
		[Phil Frost <indigo@bitglue.com>]
	- Float literals are now copied directly to the C code as written,
		to avoid problems with loss of precision.
		[Mario Pernici <Mario.Pernici@mi.infn.it>]
	- Inheriting from an extension type with C methods defined in
		another Pyrex module did not work.
		[Itamar Shtull-Trauring <itamar@itamarst.org>]

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