The executable now lives in the build directory, and since the build
directory already contains the variant name there is no need to also add
it to the executable.
Signed-off-by: Damien George <damien@micropython.org>
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 #3043.