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Fix buffer overflow when reading string from R_TextureNameForNum into Lua

Hanicef requested to merge Hanicef/SRB2:fix-buffer-overflow-gettexturefornum into next

"Strings" coming from R_TextureNameForNum are all 8 byte blocks with no guaranteed NULL-termination, so passing it directly into Lua won't work. Copying it into a 9-byte buffer first and appending a NULL character at the end fixes the problem.

Fixes #1341

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