/usr/src/castle-game-engine-4.1.1/audio/vorbisfile_conf.inc is in castle-game-engine-src 4.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | { Yes, under both Linux and Windows we want cdecl. Tested. }
{$define libvorbisfile_decl := cdecl}
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