cmake SHERPA_ONNX_HAVE_EXECINFO_H examples

k2-fsa/sherpa-onnx CMakeLists.txt :321

check_include_file_cxx(execinfo.h SHERPA_ONNX_HAVE_EXECINFO_H)

k2-fsa/sherpa-onnx sherpa-onnx/csrc/CMakeLists.txt :321

target_compile_definitions(sherpa-onnx-core PRIVATE SHERPA_ONNX_HAVE_EXECINFO_H=1)