[cleanup] Minor fixes (See desc)

* [youtube] Fix `--youtube-skip-dash-manifest`
* [build] Use `$()` in `Makefile`. Closes #3684
* Fix bug in 385ffb467b
* Fix bug in 43d7f5a5d0
* [cleanup] Remove unnecessary `utf-8` from `str.encode`/`bytes.decode`
* [utils] LazyList: Expose unnecessarily "protected" attributes
and other minor cleanup

devscripts/make_readme.py

@@ -14,7 +14,7 @@ EPILOG_START = 'See full documentation'
 
 helptext = sys.stdin.read()
 if isinstance(helptext, bytes):
-    helptext = helptext.decode('utf-8')
+    helptext = helptext.decode()
 
 start, end = helptext.index(f'\n  {OPTIONS_START}'), helptext.index(f'\n{EPILOG_START}')
 options = re.sub(r'(?m)^  (\w.+)$', r'## \1', helptext[start + 1: end + 1])

devscripts/make_supportedsites.py

@@ -3,9 +3,8 @@ import optparse
 import os
 import sys
 
-# Import yt_dlp
-ROOT_DIR = os.path.join(os.path.dirname(__file__), '..')
-sys.path.insert(0, ROOT_DIR)
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
 import yt_dlp
 
 

devscripts/update-formulae.py

@@ -17,7 +17,7 @@ normalized_version = '.'.join(str(int(x)) for x in version.split('.'))
 
 pypi_release = json.loads(compat_urllib_request.urlopen(
     'https://pypi.org/pypi/yt-dlp/%s/json' % normalized_version
-).read().decode('utf-8'))
+).read().decode())
 
 tarball_file = next(x for x in pypi_release['urls'] if x['filename'].endswith('.tar.gz'))