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66aae0900b
Cliff noticed that the CMake git ident was not being updated when pulling new changes. This was because it was getting captured at configuration time and, even if you pull more changes, the CMake configuration may not be redone automatically if the build files weren't also changed. So, this adds a new target to get the information at build time instead.
CMake requires that its CMakeList.txt files follow the directory structure of the projects. However, for Audacity this would cause collision with existing CMakeList.txt files that e.g. expat and libsoxr already provide. Our solution is to have this proxy directory for lib-src to hold our version of the CMakeList.txt files. We did try bundling several libraries under one CMakeList.txt without using subdirectories. However, we were then fighting CMake too much - and did not have a clean separation of information between sub projects. We don't need the proxies for our own 'lib_src' such as mod-script-pipe and FileDialog, where we 'own' the CMakeList.txt file.