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Attempting to compile Twinkle on a system where file(1) is not available
currently produces a confusing error message about libmagic not being
found.
The only reason to require file(1) was to obtain the libmagic version,
as the MAGIC_VERSION constant was apparently only introduced in 5.13.
But since we don't need any particular version, we might as well drop
this requirement.
Using find_program() instead of find_path() avoids picking
/usr/include/file by mistake, which resulted in a (harmless) empty
version string in the CMake output.
(Thanks to https://bro-tracker.atlassian.net/browse/BIT-1096 for
providing some of this information.)
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