Some slicing test fail with Complex<f32> and OpenBLAS

[japaric]

failures:

---- row_mul::slice::c64::mat stdout ----

thread 'row_mul::slice::c64::mat' panicked at '[quickcheck] TEST FAILED. Arguments: ((1, 99, 1), 0, 0)', /home/travis/.cargo/git/checkouts/quickcheck-a5e37b9a89cc64de/rustup/src/tester.rs:118

---- row_mul::slice::c64::view stdout ----

thread 'row_mul::slice::c64::view' panicked at '[quickcheck] TEST FAILED. Arguments: ((3, 0), (1, 98, 1), 0, 0)', /home/travis/.cargo/git/checkouts/quickcheck-a5e37b9a89cc64de/rustup/src/tester.rs:118

---- row_mul::slice::c64::view_mut stdout ----

thread 'row_mul::slice::c64::view_mut' panicked at '[quickcheck] TEST FAILED. Arguments: ((3, 0), (1, 98, 1), 0, 0)', /home/travis/.cargo/git/checkouts/quickcheck-a5e37b9a89cc64de/rustup/src/tester.rs:118

failures:

row_mul::slice::c64::mat

row_mul::slice::c64::view

row_mul::slice::c64::view_mut