Previous exif bump copied the newer version into
mediagoblin/tools/extlib/exif but not in extlib/exif. Fix this by
bumping extlib/exif and symlinking to tools/extlib/exif.
Do note that this is still the version fetched from http://sourceforge.net/projects/exif-py/
while the upstream maintainer seems to be active on:
https://github.com/ianare/exif-py
(The sf.net download is quite new though)
Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
