visp: update postinstall to support API

[cho-m]

Looks like #208060 only worked via tap since JSON API has bottle == nil.

Not sure if there is a better way, but trying to parse OS information from tab (e.g. os_version is macOS 14.7).

Also provide output similar to keg relocation. odebug would be better but looks like we never added support for that in postinstall.

Output would look like:

==> Changing SDK path in /opt/homebrew/Cellar/visp/3.6.0_12/lib/cmake/visp/VISPConfig.cmake
  from /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk
    to /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk
==> Changing SDK path in /opt/homebrew/Cellar/visp/3.6.0_12/lib/cmake/visp/VISPModules.cmake
  from /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk
    to /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk
==> Changing SDK path in /opt/homebrew/Cellar/visp/3.6.0_12/lib/pkgconfig/visp.pc
  from /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk
    to /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk

One issue is output is always shown, even with brew postinstall visp --quiet. May want to consider adding odebug support first to avoid this.

Note that odebug in current brew postinstall is pretty much a code comment since --debug is dropped when executing postinstall.rb.

[github-actions]

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[fxcoudert]

@cho-m apart from a weird audit, this seems ready to go

[cho-m]

Works for me locally when I:

1. brew install visp
2. Modify $(brew --prefix visp)/.brew/visp.rb
3. brew postinstall visp
4. brew test visp