Update libwmf package to 0.2.2.

Changes from 0.2.1 are here:

v. 0.2.2
	* fix wmf2x arg detection bug (Bob Friesenhahn)
	* added --with-layers option (fjf)
	* de-necessitate GD, add libpng support (highly experimental);
	  rename config.h* to wmfconfig.h*; libxml2 fix (fjf)
	* release builds: configure-time Darwin-detection & lt-patching;
	  make magick device layer optional; rewrite xml2 detection (wv);
	  make secondary IPA functions static (fjf)
	* change copyright on include/libwmf/magick.h
	* add paranoid check for xmlChar**attributes==NULL
	* add one of many missing consts (Bob Friesenhahn)
	* add check for vsnprintf in libdb (David C Sterratt)
	* add 'foreign' device layer for non-wmf stuff
	* x,gd: better placement of text
	* x,gd: beginnings of a ROP implementation
	* change gd-layer source file names to 'xgd' root
	* use X-layer style text drawing in gd-layer
	* yet more config updates (fun, fun, fun!)
	* update other config stuff to handle autoconf-2.52
	* update config.sub/guess to libtool-1.4.1
	* make building/inclusion of GD library optional (fjf)
	* acinclude fix (Tomasz K^3oczko)
	* up the version number (fjf)

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