Patch to make Qt5.15/ECL work with Xcode 15
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* copy 'toolchain.prf' from '~/lqml/platforms/macos/patch/' to:

  ~/Qt/5.15.2/clang_64/mkspecs/features/
  ~/Qt/5.15.2/ios/mkspecs/features/

* delete 'Makefile' and '.qmake.stash' of all apps

* copy libecl.dylib under Frameworks:

  $ sudo cp /usr/local/lib/libecl.23.9.dylib /usr/local/Frameworks/