Replace youtube_dl dependencies with youtube_dlc

[debdrup]

Summary

Since youtube_dl has disappeared, and some programs still depend on
the feature offered, make use of the youtube_dlc alternative that was recently
added to the ports framework.

[tcberner]

I think the SYMLINKS option should be turned on additionally in youtube_dlc by default.

[tcberner]

Also, I would not rename the options

[debdrup]

Address feedback

Enable SYMLINK option on youtube_dl and avoid renaming options, only rename the
description of the option.

[tcberner]

www/py-pafy will require some care:

Traceback (most recent call last):
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/pafy.py", line 51, in <module>
    import youtube_dl
ModuleNotFoundError: No module named 'youtube_dl'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 13, in <module>
    from pafy import __version__
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/__init__.py", line 7, in <module>
    from .pafy import new
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/pafy.py", line 54, in <module>
    raise ImportError(
ImportError: pafy: youtube-dl not found; you can use the internal backend by setting the environmental variable PAFY_BACKEND to "internal". It is not enabled by default because it is not as well maintained as the youtube-dl backend.
*** Error code 1

[debdrup]

In D27033#603441, @tcberner wrote:

www/py-pafy will require some care:

Traceback (most recent call last):
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/pafy.py", line 51, in <module>
    import youtube_dl
ModuleNotFoundError: No module named 'youtube_dl'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 13, in <module>
    from pafy import __version__
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/__init__.py", line 7, in <module>
    from .pafy import new
  File "/wrkdirs/usr/ports/www/py-pafy/work-py38/pafy-0.5.5/pafy/pafy.py", line 54, in <module>
    raise ImportError(
ImportError: pafy: youtube-dl not found; you can use the internal backend by setting the environmental variable PAFY_BACKEND to "internal". It is not enabled by default because it is not as well maintained as the youtube-dl backend.
*** Error code 1

Could I ask you to check if BINARY_ALIAS= youtube_dl=youtube_dlc works?

[bapt]

First this has nothing to do with BINARY_ALIAS it tries to import a python module and fails, it does not tries to find a binary in the path.

Second youtube-dl is not dead, they just made a release downloadable at https://youtube-dl.org/

[debdrup]

In D27033#603653, @bapt wrote:

First this has nothing to do with BINARY_ALIAS it tries to import a python module and fails, it does not tries to find a binary in the path.

Second youtube-dl is not dead, they just made a release downloadable at https://youtube-dl.org/

Oh, I see. Yeah, I definitely don't know enough about python to fix pafy then.

I wasn't aware youtube-dl was still active, so I guess it's an open question whether anything should even be moved around or not.

[lbartoletti]

In D27033#603653, @bapt wrote:

Second youtube-dl is not dead, they just made a release downloadable at https://youtube-dl.org/

And youtube-dl is back

• https://github.blog/2020-11-16-standing-up-for-developers-youtube-dl-is-back/

• https://github.com/ytdl-org/youtube-dl

[debdrup]

In D27033#608294, @lbartoletti wrote:

And youtube-dl is back

Huh, well, that's alright then. :)
Incidentally, it also looks like it's already been built.