Apply improvement to UV texturing of tunnel entrance, submitted on IRC. While applying I discovered that all faces are duplicated, and started cleaning that (not finished yet)
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@12333 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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