libgo: Update to weekly.2012-03-22.

libgo/MERGE

libgo/go/archive/zip/reader_test.go

libgo/go/crypto/tls/handshake_client.go

libgo/go/encoding/gob/doc.go

libgo/go/encoding/json/encode.go

libgo/go/exp/norm/normalize.go

libgo/go/exp/types/universe.go

libgo/go/flag/example_test.go

libgo/go/fmt/scan_test.go

libgo/go/go/build/build.go

libgo/go/go/build/build_test.go

libgo/go/go/printer/nodes.go

libgo/go/go/printer/testdata/declarations.golden

libgo/go/go/printer/testdata/declarations.input

libgo/go/html/template/clone_test.go

libgo/go/html/template/content.go

libgo/go/html/template/escape.go

libgo/go/html/template/escape_test.go

libgo/go/html/template/template.go

libgo/go/image/draw/draw.go