test: fix 386 build (missing complex)

R=ken2
CC=golang-dev
https://golang.org/cl/223106

test/golden.out

@@ -56,12 +56,6 @@ Hello World!
 
 == ken/
 
-=========== ken/cplx0.go
-(+5.000000e+000,+6.000000e+000i)
-(+5.000000e+000,+6.000000e+000i)
-(+5.000000e+000,+6.000000e+000i)
-(+5.000000e+000,+6.000000e+000i)
-
 =========== ken/intervar.go
  print 1 bio 2 file 3 -- abc
 

test/ken/cplx0.go

+// true  # disabled until 8g has complex
+
 // $G $D/$F.go && $L $F.$A && ./$A.out
 
 // Copyright 2009 The Go Authors. All rights reserved.

test/ken/cplx1.go

-// $G $D/$F.go && $L $F.$A && ./$A.out
+// [ $GOARCH != amd64 ] || ($G $D/$F.go && $L $F.$A && ./$A.out)
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

test/ken/cplx2.go

-// $G $D/$F.go && $L $F.$A && ./$A.out
+// [ $GOARCH != amd64 ] || ($G $D/$F.go && $L $F.$A && ./$A.out)
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style