4919fe1352581a793d4817c06d0a9005fbbcc526
AFAICT, it was never hooked up to meson, so it'd only work if somebody manually defined the flag. I think it's preferable to drop the ifdef: it removes only a single access call to a fixed location, which is realy cheap. If poeple don't want to make use of this, they should just not create the file. Making this both compile-time optional and opt-in in the filesystem is unnecessary.
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