Koen Zandberg ff3bee24b9 picolibc: Provide integration into the build system [v3]
Support for picolibc as alternative libc implementation is added with
this commit. For now only cortex-m CPU's are supported.

Enable via PICOLIBC=1

---
v2:
	squash fixes in

v3:
	Remove picolibc integer printf/scanf stuff from sys/Makefile.include,
	it gets set in makefiles/libc/picolibc.mk

fixup for dependency
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