build-probe-mpi

It's used at build time in 11 crates (of which 7 optionally, 3 directly).

Depender (with downloads and own rev deps)			build-probe-mpi version
1.5K	4	mpi-sys	build	^0.1.3
1.1K	4	mpi	build	^0.1.3
	1	mpi-fork-fnsp	build	^0.1