Function winspawn::move_fd

pub fn move_fd<E, R, F>(
    fd: &FileDescriptor, 
    dest: c_int, 
    func: F
) -> Result<R, E> where
    F: FnOnce(&FileDescriptor) -> Result<R, E>,
    E: From<Error>, 

Move fd temporary and call func.

This function valid in this library lock acquires.