Fix building with modern PICO-SDK

[intx82]

Fix build mentioned in issue #16

[Plaque-fcc]

Hi! You suggest not building the demo blinky firmware intentionally or by an accident?

[Plaque-fcc]

Shouldn't really have other changes not mentioned in the name and/or not related to fixing the issue.

[intx82]

There was an error in my case, so i just disable a blinky. As for me, it's redundant to build blinky while you not suggest use it.

And due to blinky have own shell script to build it instead of Makefile and i am using riscv32-unknown-elf-gcc instead of default riscv64-linux-elf-gcc (or whatever inside), it was too lazy to repair that i don't need. I think this option will be the same for the lot of people.

[Plaque-fcc]

There was an error in my case, so i just disable a blinky. As for me, it's redundant to build blinky while you not suggest use it.

And due to blinky have own shell script to build it instead of Makefile and i am using riscv32-unknown-elf-gcc instead of default riscv64-linux-elf-gcc (or whatever inside), it was too lazy to repair that i don't need. I think this option will be the same for the lot of people.

Thank you for your honest and elaborated answer. Although I don't agree with your style of submitting changes, I respect your decision.
Moreover, you helped me and others use the latest SDK version.

However, these two changes are not linked in any way, and only one of them is described in the commit message. Should be both. Or better separated in respective PRs each.