go/build: test code cleanup: remove unnecessary func var

The earlier calls to test(false) in TestDependencies were
removed by https://golang.org/cl/12576

Change-Id: If5c7994172379c2d7f633d2e9c5261e668c754fa
Reviewed-on: https://go-review.googlesource.com/16117Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/go/build/deps_test.go

@@ -456,7 +456,6 @@ func TestDependencies(t *testing.T) {
 	}
 	sort.Strings(all)
 
-	test := func(mustImport bool) {
 	for _, pkg := range all {
 		imports, err := findImports(pkg)
 		if err != nil {
@@ -474,8 +473,6 @@ func TestDependencies(t *testing.T) {
 			t.Errorf("unexpected dependency: %s imports %v", pkg, bad)
 		}
 	}
-	}
-	test(true)
 }
 
 var buildIgnore = []byte("\n// +build ignore")