The properties added by commit 4a62e3d97c (macOS: Add
OSX_COMPATIBILITY_VERSION and OSX_CURRENT_VERSION properties,
2020-01-24, v3.17.0-rc1~80^2~1) are general-purpose for all platforms
using Mach-O formats and not just on OS X. Rename them accordingly.
The properties are new to the CMake 3.17 release so we can rename
them without compatibility concerns.
Fixes: #20442
In commit 730a53ef1d (Help: Organize and revise 3.17 release notes,
2020-02-04, v3.17.0-rc1~21^2) we accidentally combined the release notes
for `CMAKE_XCODE_SCHEME_ENVIRONMENT` and `XCODE_SCHEME_WORKING_DIRECTORY`.
Split them up again. Also mention `CMAKE_XCODE_SCHEME_WORKING_DIRECTORY`.
Fixes: #20439
