message: Don't throw but interrupt
diff: #if defined(VSNRAY_OS_DARWIN) || defined(VSNRAY_OS_LINUX)
  #include <execinfo.h>
  +#include <signal.h>
  #endif
  #ifdef VSNRAY_OS_WIN32
  @@ -130,7 +131,7 @@ static void debug_callback_func(
  }
  #else
  std::cerr << gl::backtrace() << '\n';
  - throw std::runtime_error("OpenGL error");
  + raise(SIGINT);
  #endif
  }
  }
  