Fix running test_qrspec when building out-of-source It is a common practice for CMake builds (and less common but still valid for autotools) to build out-of-source, that is use a separate directory for built executables than for sources. However, when that is used, test_qrspec is unable to find "frame" and crashes. Fix it by passing the source directory as compile-time definition, and therefore making test_qrspec use the correct path.