graphics/libgphoto2: Update to 2.5.22, graphics/gphoto2: Update to 2.5.20

• Bump PORTREVISION of ports depending on them.

Also while I'm here:

• Add "gnome" to USES if the XML option is enabled to avoid warnings about using USE_GNOME alone.
• Pet portlint

Notable changes since 2.5.16 (graphics/libgphoto2) [1]:

• Added new USB Ids for various camera types
• Updated translations
• Report file changes via GP_EVENT_FILE_CHANGED (hooked up for Canon EOS currently)

Changes since 2.5.15 (graphics/gphoto2) [2]:

• Maximum number in file ranges bumped from 16384 to 65536
• Add shell commands to match commandline: summary, storage-info, trigger-capture
• Fixed a fd leak
• Updated translations
• Handle GP_EVENT_FILE_CHANGED event

https://github.com/gphoto/libgphoto2/blob/libgphoto2-2_5_22-release/NEWS
https://github.com/gphoto/gphoto2/blob/gphoto2-2_5_20-release/NEWS

PR: 235817 [1], 235818 [2]
Submitted by: Darren Mulligan <fixer@bsdmail.com>
Approved by: woodsb02 (maintainer timeout)