Force qstr rebuild when doing make

[danhalbert]

I made a code change which makes a qstr rebuild necessary. If I just do make, I get a compile error related to qstr's. I could just do make clean, but is there a better/faster way? Or does a qstr rebuild really force a full re-make? Thanks.

[dhylands]

Currently, doing a clean or a make -B is "the way" There is a bug in the qstr dependencies that needs to be fixed/resolved.

[stijn]

Also see https://github.com/micropython/micropython/issues/2982