* don't force Debian-style games prefix - distros that want it can add
it with -DCMAKE_INSTALL_DATAROOTDIR=/share/games etc., but it should
be easy for normal distros to not get the prefix and end up with a
working build.
* only set GLOBAL_DATA_PATH/GLOBAL_CONFIG_PATH defines for the one file
that uses them. This means changing them won't force a rebuild of
every single file.
* improve how those defines are used to eliminate some fuckiness
AnyOldName3
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