Bug 9312: strict perl for picture-upload.pl

Bug 9312: strict perl for picture-upload.pl

Testing - this is a code-cleanup patch, so the purpose
of testing is to ensure that patron image upload functionality
still works.  To test:

- Turn on the patronimages system preference
- Go to Tools | Upload patron images and import a suitable image
  for a test patron.
- Bring up the test patron and verify that the image is attached.
- From the patron details page, upload a replacement image.
- Create a patron image ZIP file containing at least two images (
  per the documentation of the patron image feature) and load it
  via the patron image import tool.
- Verfiy that the test patrons now have images.
- Verify that tools/picture-upload.pl didn't report any errors
  in the Apache error log.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>