travis,unit: fix and check unit code generation
Also fix blas generate check for move.
MODIFY
.travis/check-generate.sh
.travis/check-generate.sh
#!/bin/bash
-go generate gonum.org/v1/gonum/blas/native
+go generate gonum.org/v1/gonum/blas/gonum
+go generate gonum.org/v1/gonum/unit
if [ -n "$(git diff)" ]; then
exit 1
fi

MODIFY
unit/doc.go
unit/doc.go
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
+//go:generate go run autogen.go
+
// Package unit provides a set of types and constants that facilitate
// the use of the International System of Units (SI).
//

travis,unit: fix and check unit code generation

Also fix blas generate check for move.