[RFA] Fix osdata.c compile error without libexpat

[teawater]

Hi,

I got GDB-cvs build error if there is not libexpat.
I found that osdata.c file doesn't define function "osdata_parse" if
!defined(HAVE_LIBEXPAT). But in below, it is need.
So I make a patch for it.

2008-12-02  Hui Zhu  <teawater@gmail.com>

	* osdata.c (osdata_item_clear): New empty funtion just for
	compile without libexpat.

Thanks,
Hui
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