[arch-general] Patch for update-mime-info slowness

[Alexander Rødseth]

Yet another option is to fork shared-mime-info and upload an AUR
package for the fork.
If upstream WONTFIX an issue that several people perceive to be a bug,
or WONTFIX a popular feature request, they should be aware that
someone forking the project is a real possibility.
Such are they perils and joys of open source software.

- Alexander / xyproto