updated libmagic to version 5.38

[vseryakov]

[mscdex]

Unfortunately this removes a lot of custom changes (which admittedly need to be written as a separate patch) needed for cross-platform compatibility.

Is there a particular reason you need 5.38 at the moment?

[vseryakov]

i suspected this so no urgency, i discovered that detecting .xlsx files can only be done with recent libmagic, with 5.38 it works fine as the file utility. i had to switch to run the file to detect Excel files for now but this is just FYI, at least it works without crashing

[Strangerxxx]

check sharekey/mmmagic#1 for fix of the issue of false detection