target: mbedos5: source/pins.cpp is no longer generated against mbed OS 5.2

[janjongboom]

Go to build/jerryscript/targets/mbedos5, then run make source/pins.cpp.

This fails, because the Target constructor has been removed in mbed OS 5.2 now; which is used in https://github.com/jerryscript-project/jerryscript/blob/master/targets/mbedos5/tools/generate_pins.py.

[theotherjimmy]

The Target constructor has been replaced by target from tools/targets.py it should have the same signature. See comment below

[theotherjimmy]

I take it back. What you want is Target.get_target