Function nginx::CRYPTO_set_mem_functions

pub unsafe extern "C" fn CRYPTO_set_mem_functions(
    m: Option<unsafe extern "C" fn(arg1: size_t, arg2: *const c_char, arg3: c_int) -> *mut c_void>, 
    r: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: size_t, arg3: *const c_char, arg4: c_int) -> *mut c_void>, 
    f: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *const c_char, arg3: c_int)>
) -> c_int