Merge topic 'apple-compiler-selection'

7b19531291 macOS: Do not pass any SDK/-isysroot to compilers by default
3b8b70fe72 macOS: Simplify logic converting CMAKE_OSX_SYSROOT to a path
c55c113076 macOS: Revert finding tools inside Xcode that are not in the PATH
77fcee9204 macOS: Revert "Resolve compiler in /usr/bin to that reported by Xcode xcrun"
9eb530842c Tests/RunCMake/CMakePresets: Do not forward empty CMAKE_MAKE_PROGRAM
7fb14e707d Tests/RunCMake/XcFramework: Use macosx SDK in all multi-arch macOS cases
70ff1f15fc Tests/CTestTest*: Detect compiler from environment
1faf60cffc Tests/FortranC: Handle empty CMAKE_OSX_SYSROOT
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Acked-by: scivision <michael@scivision.dev>
Acked-by: FX Coudert <fxcoudert@gmail.com>
Merge-request: !9977