cmake HAVE_X86_OR_X64_TARGET examples

maidsafe-archive/MaidSafe cmake_modules/find_ubsan.cmake :111 

check_cxx_source_runs(
  "
  int main(int argc, const char* argv[])
  {
  #if defined(__i386) || defined(__i386__) || defined(_M_IX86)
      /* I am x86 */
  #elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64)
      /* I am x64 */
  #else
  #error I am neither x86 nor x64
  #endif
      return 0;
  }
  "
    HAVE_X86_OR_X64_TARGET)