cmake HAVE_SYSEXITS_H examples

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/cmake/config-ix.cmake :56 

check_include_file(sysexits.h HAVE_SYSEXITS_H)

root-project/root interpreter/llvm-project/llvm/cmake/config-ix.cmake :60 

check_include_file(sysexits.h HAVE_SYSEXITS_H)

NVIDIA/MDL-SDK src/mdl/jit/llvm/dist/cmake/config-ix.cmake :57 

check_include_file(sysexits.h HAVE_SYSEXITS_H)