Update Mac Legacy from Qt 5.9.9 to 5.15.2 #3235
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Short description of changes
Updates the CI build process and makefiles for Mac Legacy to use Qt 5.15.2 instead of 5.9.9. This allows other things also to be improved separately, as described in #3234
CHANGELOG: Update Mac Legacy build to use Qt 5.15.2, now compatible with MacOS 10.13 (High Sierra) or newer.
Context: Fixes an issue?
Fixes #3234
Does this change need documentation? What needs to be documented and how?
We would need to document in the release notes and any download page that the minimum supported version of MacOS for the Legacy build would be 10.13 (High Sierra)
Status of this Pull Request
Working, but awaiting agreement on using Qt 5.15.2.
What is missing until this pull request can be merged?
Just agreement on using Qt 5.15.2
Checklist