misc/cgo/testshared: remove unused flag.Parse()

TestMain doesn't make use of any flags.

Change-Id: I98ec582fb004045a5067618f605ccfeb1f9f4bbb
Reviewed-on: https://go-review.googlesource.com/33613Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

misc/cgo/testshared/shared_test.go

@@ -10,7 +10,6 @@ import (
 	"debug/elf"
 	"encoding/binary"
 	"errors"
-	"flag"
 	"fmt"
 	"go/build"
 	"io"
@@ -166,7 +165,6 @@ func TestMain(m *testing.M) {
 	// That won't work if GOBIN is set.
 	os.Unsetenv("GOBIN")
 
-	flag.Parse()
 	exitCode, err := testMain(m)
 	if err != nil {
 		log.Fatal(err)