Merge #13617: release: require macOS 10.10+

3828a79711 scripted-diff: prefer MAC_OSX over __APPLE__ (fanquake)
fa6e841e89 gui: remove macOS ProgressBar workaround (fanquake)
68c272527f gui: remove SubstituteFonts (fanquake)
6c6dbd8af5 doc: mention that macOS 10.10 is now required (fanquake)
84b0cfa8b6 release: bump minimum required macOS to 10.10 (fanquake)
26b15df99d depends: set OSX_MIN_VERSION to 10.10 (fanquake)

Pull request description:

  Closes #13362

  d99abfddb0c8f2111340a6127e77cc686e0043d8
  This workaround should no longer be required, as it should have only been in use when compiled with the 10.7 SDK, which we haven't been building with for a while now.

  5bc5ae30982a0f0f6a9804b05d99434af770c724
  The bugreport linked with this code is for an unrelated? issue, however from what I can tell the correct QTBUG is this one https://bugreports.qt.io/browse/QTBUG-20880. Reading though the discussion there, it seems that the way progress bars are animated changed in macOS 10.10.
  Qt was patched [here (5.5+)](https://codereview.qt-project.org/#/c/112379/):
  > Disable progress bar animations on 10.10 Yosemite and higher - the native style does not animate them any more. Keep the indeterminate progress bar animation.

  Given all of that, I don't think this is worth keeping around, as it would seem to only be useful in the case that a macOS user is compiling with a Qt < 5.5. That should be pretty unlikely, as we don't support downloaded Qt binaries, and brew currently provides [5.11.1](https://github.com/Homebrew/homebrew-core/blob/571b46213c70ca1573da6d0425b0bd6df34961ee/Formula/qt.rb).

Tree-SHA512: 4278cb30cc9bcb313e166129ecf032c808995f8b51a3123637c47860a0010ac88f86f82ec44792153b6b1e5cca595f25013b2eaeae80194647b9ce4f7eaf32c1

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