Removed duplicated materials.xml entry, which could potentially cause a
crash on certain systems during installation ("/usr/bin/install: will
not overwrite just-created ...").
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4426 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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