Set MAKE env var

[jsharpe]

Rework of patch in #549. Fixes #590.

[UebelAndre]

I think this is a fine change but I wonder if we could solve for the same thing by fixing the way we inject things into PATH. Would that solve for the same thing?

[jsharpe]

I think this is a fine change but I wonder if we could solve for the same thing by fixing the way we inject things into PATH. Would that solve for the same thing?

No, because that would rely on the tool in the make toolchain being called "make" whereas setting the MAKE environment variable allows tools to be named differently e.g. gmake is a common name for installing GNUMake on systems that have BSD make under the name make

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[UebelAndre]

@googlebot I fixed it.

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[UebelAndre]

@googlebot I fixed it.

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[UebelAndre]

I'm not sure what's up with CLA but @jsharpe and I have definitely signed it.