Add xom.h to the project file so everything's listed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2338 c06c8d41-db1a-0410-9941-cceddc491573

Created by  nlanza  on October 5, 2007
4HWDIZAZ34XD44XTPKRBXGF6PYZVL7DYUQVFA3Q5PTRJBBEEPAQAC
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