Log Message:
youtube-dl: Update to 20200115

pkgsrc changes:
 - Apply a pkgsrc patch to fix la7 extractor (shared upstream)

Changes:
20200115
--------
Extractors
* [yourporn] Fix extraction (#21645, #22255, #23459)
+ [canvas] Add support for new API endpoint (#17680, #18629)
* [ndr:base:embed] Improve thumbnails extraction (#23731)
+ [vodplatform] Add support for embed.kwikmotion.com domain
+ [twitter] Add support for promo_video_website cards (#23711)
* [orf:radio] Clean description and improve extraction
* [orf:fm4] Fix extraction (#23599)
* [safari] Fix kaltura session extraction (#23679, #23670)
* [lego] Fix extraction and extract subtitle (#23687)
* [cloudflarestream] Improve extraction
    + Add support for bytehighway.net domain
    + Add support for signed URLs
    + Extract thumbnail
* [naver] Improve extraction
    * Improve geo-restriction handling
    + Extract automatic captions
    + Extract uploader metadata
    + Extract VLive HLS formats
    * Improve metadata extraction
- [pandatv] Remove extractor (#23630)
* [dctp] Fix format extraction (#23656)
+ [scrippsnetworks] Add support for www.discovery.com videos
* [discovery] Fix anonymous token extraction (#23650)
* [nrktv:seriebase] Fix extraction (#23625, #23537)
* [wistia] Improve format extraction and extract subtitles (#22590)
* [vice] Improve extraction (#23631)
* [redtube] Detect private videos (#23518)