Install all licenses

[vladimyr]

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Handle cases of dual licensing where license filenames start with "LICENSE-" or "LICENCE-" prefix.
Continuation of #7953

[reitermarkus]

Now the two entries in BASENAMES are not used anymore.

[vladimyr]

True that, do we want to get rid of them?

[reitermarkus]

Either that, or move them to something like BASENAME_REGEXES:

BASENAME_REGEXES = [/^licen(c|s)e(\-|$)/].freeze

and change the check to

BASENAMES.include?(file) || BASENAME_REGEXES.any? { |r| r.match?(file) }

so we don't even need the license? helper function.

[reitermarkus]

Doesn't even need to be an array of regexes.

[MikeMcQuaid]

@vladimyr Did you get my email on 26th June? If not: let me know and I'll resend. Thanks!

[Rylan12]

@vladimyr any progress on this? I've found another similar instance that should probably be added to this PR.

In Homebrew/homebrew-core#60066 I realized that the COPYING files was copied but lot COPYING.LESSER. I had a potential solution open in #8499 but it probably makes more sense to add it here.