Disable Real MIME Check

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With the upgrade to WordPress 4.7.1, some non-image files fail to upload on certain server setups. This will be fixed in 4.7.3, see the Trac ticket. In the meantime, this plugin is a workaround that disables the recently introduced strict MIME check to restore the upload functionality. Don’t forget to remove the plugin once WordPress 4.7.3 is available!