build

Further GPU-aware MPI fixes #259

Job	Run time
ci (Release, linux gnu-10)	2m 5s
ci (Release, linux clang-12)	1m 33s
ci (Release, linux nvhpc-21.9)	14m 0s
ci (Release, linux intel-classic)	4m 38s
ci (Release, macos)	23m 40s
ci (Debug, linux gnu-10)	3m 27s
ci (Debug, linux clang-12)	1m 45s
ci (Debug, linux nvhpc-21.9)	16m 57s
ci (Debug, linux intel-classic)	5m 45s
ci (Debug, macos)	23m 47s
	1h 37m 37s

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