adapt to changes in cortex-m-rtfm

examples/blinky-await.rs

examples/blinky-blocking.rs

examples/blinky-futures.rs

examples/blinky.rs

examples/capture1.rs

examples/capture2.rs

examples/capture3.rs

examples/capture4.rs

examples/concurrent-await.rs

examples/concurrent-futures.rs

examples/concurrent.rs

examples/cpu.rs

examples/gpio.rs

examples/hello.rs

examples/itm.rs

examples/led.rs

examples/loopback.rs

examples/pwm-control.rs

examples/pwm1.rs

examples/pwm2.rs