cmake KWSYS_CXX_HAS_EXECINFOH examples

InsightSoftwareConsortium/ITK Modules/ThirdParty/KWSys/src/KWSys/CMakeLists.txt :504 

check_include_file_cxx("execinfo.h" KWSYS_CXX_HAS_EXECINFOH)

Kitware/kwiver vital/kwiversys/CMakeLists.txt :601 

CHECK_INCLUDE_FILE_CXX("execinfo.h" KWSYS_CXX_HAS_EXECINFOH)

Kitware/VTK Utilities/KWSys/vtksys/CMakeLists.txt :532 

CHECK_INCLUDE_FILE_CXX("execinfo.h" KWSYS_CXX_HAS_EXECINFOH)

ornladios/ADIOS2 thirdparty/KWSys/adios2sys/CMakeLists.txt :512 

CHECK_INCLUDE_FILE_CXX("execinfo.h" KWSYS_CXX_HAS_EXECINFOH)