testlapack,native,cgo: build Dgeev benchmark conditioned on go1.7 tag

native/bench_test.go

@@ -0,0 +1,15 @@
+// Copyright ©2016 The gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.7
+
+package native
+
+import (
+	"testing"
+
+	"github.com/gonum/lapack/testlapack"
+)
+
+func BenchmarkDgeev(b *testing.B) { testlapack.DgeevBenchmark(b, impl) }