unix: add build variants (v2) #5519
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This allows ports/variants to configure MICROPY_FORCE_32BIT after including mkenv.mk, but before py.mk.
Invoking "make" will still build the standard "micropython" executable, but other variants are now build using, eg, "make VARIANT=minimal". This follows how bare-metal ports specify a particular board, and allows running any make target (eg clean, test) with any variant. Convenience targets (eg "make coverage") are provided to retain the old behaviour, at least for now. See issue micropython#3043.
This will eventually become the "full featured" unix binary with more features enabled, specifically useful for development and testing.
For consistency with mpy-cross, and other unix tools in general.
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…o-rp2040 Add New Board - Seeeduino XIAO RP2040
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Updated version of #5253 to pass all CI tests.