When using gcc (the Linux/UNIX compiler) static class members must be

initialized outside of the class declaration or they won't by defined in any of the object files, leading to "undefined reference" errors when linking.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5336 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 29, 2008
KG3D4GGXEYUSFORCP4WVOABKHSGNPS6YV4GEO27AGQVPWGQDP76AC
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