Correct mistake about supporting sub-makes and document CARGO_MAKEFLAGS #8741
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Sub-makes are currently not supported as the jobserver crate only
sets CARGO_MAKEFLAGS which GNU Make doesn't understand.
This might be reasonable as cargo overriding existing MAKEFLAGS
variables would be weird, but also makes the statement in the
reference false.
It's helpful for build script authors who want to invoke make
to know how to get make subprocesses work with parallel builds.