If a changed file is in frozen, supervisor, shared-bindings,
shared-module or common-hal, then compute board settings to
determine if it is impacted.
This should reduce the boards built for changes that are in those
directories.
When the submodule is modified, the modified 'filename' is simply the
submodule path `extmod/ulab`, not the specific file(s) in the submodule
that are modified.
This targets the 64-bit CPU Raspberry Pis. The BCM2711 on the Pi 4
and the BCM2837 on the Pi 3 and Zero 2W. There are 64-bit fixes
outside of the ports directory for it.
There are a couple other cleanups that were incidental:
* Use const mcu_pin_obj_t instead of omitting the const. The structs
themselves are const because they are in ROM.
* Use PTR <-> OBJ conversions in more places. They were found when
mp_obj_t was set to an integer type rather than pointer.
* Optimize submodule checkout because the Pi submodules are heavy
and unnecessary for the vast majority of builds.
Fixes#4314
