--update flag does not resolve symbolic links when writing to disk

[VADemon]

Checklist:

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.01.24
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
  ↑ Not applicable
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

(Using 1 version behind for testing purposes)

Verbose log

Z:\>youtube-dl.exe --version
2020.01.15

Z:\symlink-test>mklink ydl.exe youtube-dl.exe
symbolic link created for ydl.exe <<===>> youtube-dl.exe

Z:\symlink-test>ydl -U --verbose
[debug] System config: []
[debug] User config: ['--limit-rate', '10M', '-f']
[debug] Custom config: []
[debug] Command-line args: ['-U', '--verbose']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2020.01.15
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: none
[debug] Proxy map: {}
Updating to version 2020.01.24 ...
Waiting for file handle to be closed ...

Z:\symlink-test>Updated youtube-dl to version 2020.01.24.

Z:\symlink-test>ydl --version
2020.01.24

Z:\symlink-test>youtube-dl.exe --version
2020.01.15

Description

Using the -U flag does not resolve symbolic links for the executable on Windows.

Expected: youtube-dl resolves the symbolic link and writes to the final destination.

Reproducable on Windows cmd and within Cygwin:

1. Download youtube-dl.exe and create a symlink by the name "ydl.exe"
2. Using the symbolic link, update: ydl -U
3. Result: ydl.exe is now a file and the most recent version; youtube-dl.exe remained an old version.