cmake Execinfo examples

symforce-org/symforce third_party/symengine/CMakeLists.txt :480 

find_package(EXECINFO REQUIRED)

nfs-ganesha/nfs-ganesha src/CMakeLists.txt :1011 

find_package(ExecInfo REQUIRED)

fcitx/fcitx5 CMakeLists.txt :132 

find_package(Execinfo)