Patch for "master" branch: https://reviews.mahara.org/3180

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https://bugs.launchpad.net/bugs/1249858

Title:
  Mahara can't figure out mime types because of a finfo() bug

Status in Mahara ePortfolio:
  In Progress
Status in Mahara 1.6 series:
  In Progress
Status in Mahara 1.7 series:
  In Progress
Status in Mahara 1.8 series:
  In Progress
Status in Mahara 1.9 series:
  In Progress

Bug description:
  There have been several notable Mahara bugs based around the fact that
  our current handling of mimetypes is broken.

  See for instance:
   - https://bugs.launchpad.net/mahara/+bug/1220639
   - https://bugs.launchpad.net/mahara/+bug/1249166

  The problem is this:

  1. You can't really trust the mimetype that the browser sends to you, because 
different browsers send different wacky things
  2. Mahara has long used its own function file_mime_type() in lib/file.php for 
this purpose
  3. file_mime_type() preferentially uses finfo() to check the mimetype. But, 
there's a bug in finfo() with an external magic db, which is how it is 
distributed on Ubuntu presently: https://bugs.php.net/bug.php?id=61940
  4. file_mime_type() falls back to mime_content_type(). But that's now 
deprecated
  5. If neither of those works, we fall back to trusting what the browser told 
us, which isn't really the best (see #1)

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