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Closes #1413 Closes #1414 This commit addresses issues with building PortMixer using the upstream version of PortAudio. The resulting solution allows: * To build Linux with the vanilla PortAudio. * To build Windows with the vanilla PortAudio, but the notable exceptions: * for PortMixer to work on MME - PA 19.7.0 is required; only static linking is supported. A patch is available to allow dynamic linking; * for PortMixer to work on DirectSound - the patch is always required. Remove nyquist autotools
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.