cmake HAVE_SQRT_NO_LIBM examples

LiangliangNan/MVStudio 3rd_party/cminpack/CMakeLists.txt :67 

check_function_exists (sqrt HAVE_SQRT_NO_LIBM)

devernay/cminpack CMakeLists.txt :144 

check_function_exists (sqrt HAVE_SQRT_NO_LIBM)