games/spellathon: Fix build with Clang 6

main.cc:378:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]

fprintf(stderr, "Spellathon "VERSION" (svn%s)    (c)"COPYRIGHT"\n\n"
                             ^

http://beefy12.nyi.freebsd.org/data/head-amd64-default/p475964_s336959/logs/errors/spellathon-6.0_5.log