build-probe-mpi

It's used at build time in 22 crates (of which 17 optionally, 3 directly).

Depender (with downloads and own rev deps)			build-probe-mpi version
3.5K	10	mpi-sys	build	^0.1.4
2.9K	10	mpi	build	^0.1.4
	1	mpi-fork-fnsp	build	^0.1