High Sierra Compatibility for generate_cask_token

[qkdreyer]

user@elcapitan ~ % sw_vers
ProductName:	Mac OS X
ProductVersion:	10.11.6
BuildVersion:	15G1510
user@elcapitan ~ % l /System/Library/Frameworks/Ruby.framework/Versions/Current
lrwxr-xr-x  1 root  wheel     3B Oct 21  2015 /System/Library/Frameworks/Ruby.framework/Versions/Current -> 2.0

user@sierra ~ % sw_vers
ProductName:	Mac OS X
ProductVersion:	10.12.6
BuildVersion:	16G29
user@sierra ~ % l /System/Library/Frameworks/Ruby.framework/Versions/Current
lrwxr-xr-x  1 root  wheel     3B Sep 22  2016 /System/Library/Frameworks/Ruby.framework/Versions/Current -> 2.0

user@highsierra ~ % sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13
BuildVersion:	17A365
user@highsierra ~ % l /System/Library/Frameworks/Ruby.framework/Versions/Current
lrwxr-xr-x  1 root  wheel     3B 27 sep 14:20 /System/Library/Frameworks/Ruby.framework/Versions/Current -> 2.3

[reitermarkus]

This makes me wonder which of the scripts in developer/bin are actually still useful. Pretty sure we don't need irregular_cask_whitespace anymore since we have brew cask style.

@caskroom/maintainers?

[commitay]

Agree that we don't need irregular_cask_whitespace.

I think cask_switch_https would be (partially) replaced by #25403 (HTTPS audit check.)

All of the other scripts are still useful.

[vitorgalvao]

project_stats and the_long_tail can also get the boot.