"XML_Parser" in cmexpat is a typedef for void* while newer releases of
expat seem to use struct XML_ParserStruct *XML_Parser.
Add static_casts so that the build works with either variant.
Added a new variable CPACK_WIX_PATCH_FILE that users can point at an
XML patch file. Fragments defined within the patch file will be inserted
at supported insertion points (currently Component, File and Directory).
Nils Gladitz
Ben Boeckel