CI: Build pipelines for macOS fail

[maxhgerlach]

It looks like pyenv fails to build Python 3.7.7 because it can't find the clang++ compiler (but the log is incomplete, there may be more).

Installing Python-3.7.7...
patching file Misc/NEWS.d/next/macOS/2020-06-24-13-51-57.bpo-41100.mcHdc5.rst
patching file configure
Hunk #1 succeeded at 3374 (offset -52 lines).
patching file configure.ac
Hunk #1 succeeded at 490 (offset -20 lines).
python-build: use tcl-tk from homebrew
python-build: use readline from homebrew
python-build: use zlib from xcode sdk

BUILD FAILED (OS X 12.6.2 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/python-build.20230106010328.4626
Results logged to /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/python-build.20230106010328.4626.log

Last 10 log lines:
checking for --with-cxx-main=<compiler>... no
checking for clang++... no
configure:

  By default, distutils will build C++ extension modules with "clang++".
  If this is not intended, then set CXX on the configure command line.
  
checking for the platform triplet based on compiler characteristics... darwin
configure: error: internal configure error for the platform triplet, please file a bug report
make: *** No targets specified and no makefile found.  Stop.

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