configure.ac: update totem-pl-parser requirements to 3.26.6
3.26.6 contains the following improvements:
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Quite a lot of RSS and Atom related fixes have gone into 3.26.6. This provides better RSS / Atom data to Rhythmbox ( like better images to podcast feeds / episodes ).
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Parsing feeds is now faster ( 150x ) for some feeds ( e.g. bbc ) in debian/ubuntu, now that videosite checking is disabled unless explicitly requested.
Refer totem-pl-parser#25 (closed) for more details.
- Garbage CDATA issue has been fixed in xine xml parser.
Refer totem-pl-parser#30 (closed) for more details.