Merge pull request #1421 from rust-ndarray/blas-simplify #258

Job	Run time
docs/stable	25s
cargo-careful	2m 23s
clippy/stable	32s
cross_test/s390x-unknown-linux-gnu/stable	5m 54s
format/nightly	16s
cross_test/i686-unknown-linux-gnu/stable	1m 41s
nostd/thumbv6m-none-eabi/stable	15s
tests/stable	3m 17s
tests/beta	2m 56s
tests/nightly	3m 28s
tests/1.64.0	4m 51s
conclusion	1s
	25m 59s

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