cmake HAVE_PROC_PID_RUSAGE examples

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/cmake/config-ix.cmake :431 

check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)

root-project/root interpreter/llvm-project/llvm/cmake/config-ix.cmake :409 

check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)

swiftlang/swift CMakeLists.txt :1502 

check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)