Add support for Iltalehti

[lordlouckster]

Checklist

• I'm reporting a new site support request
• I've verified that I'm running youtube-dl version 2020.06.16.1
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that none of provided URLs violate any copyrights
• I've searched the bugtracker for similar site support requests including closed ones

Example URLs

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

Description

https://en.wikipedia.org/wiki/Iltalehti

youtube-dl --verbose https://www.iltalehti.fi/kotimaa/a/22a7cc8e-7458-49e2-ba5a-1bc5ed651240
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.iltalehti.fi/kotimaa/a/22a7cc8e-7458-49e2-ba5a-1bc5ed651240']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2020.06.16.1
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg 4.2.3, ffprobe 4.2.3
[debug] Proxy map: {}
[generic] 22a7cc8e-7458-49e2-ba5a-1bc5ed651240: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 22a7cc8e-7458-49e2-ba5a-1bc5ed651240: Downloading webpage
[generic] 22a7cc8e-7458-49e2-ba5a-1bc5ed651240: Extracting information
ERROR: Unsupported URL: https://www.iltalehti.fi/kotimaa/a/22a7cc8e-7458-49e2-ba5a-1bc5ed651240
Traceback (most recent call last):
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpspbsbtmq\build\youtube_dl\YoutubeDL.py", line 797, in extract_info
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpspbsbtmq\build\youtube_dl\extractor\common.py", line 530, in extract
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpspbsbtmq\build\youtube_dl\extractor\generic.py", line 3382, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.iltalehti.fi/kotimaa/a/22a7cc8e-7458-49e2-ba5a-1bc5ed651240