Give testrunner macOS-support #16
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MacOS does not include the argp library at default. It may be installed via homebrew and needs to be linked to the build.
syscall(SYS_gettid) is not supported on macOS. To mitigate this instead use pthread_self() to get an id for the current thread. While not unique globally, it's unique within the same process which should serve the purposes here sufficiently.
Self-assignment cause warnings in clang. Use void cast instead, once again silencing the warnigns.
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A few things are missing in macOS to run test runner properly. Deal with them. Use pthread for thread-id instead of syscall. Add libargp as an explicit library when building under Darwin due to it not being part of the standard lib on macOS. Also address som compiler warnings running with apple clang.