Keith Packard c15de32ec6 Add picolibc support [v2]
This adds support for using picolibc instead of newlib on embedded
systems.

Signed-off-by: Keith Packard <keithp@keithp.com>

v2:
	Add check for meson and ninja
	Sync option default values with current picolibc defaults
	Remove xtensa sys header file install as those aren't in picolibc
2020-09-01 09:42:53 -07:00
..
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