Update Go library to r60.3 release.

gcc/testsuite/go.test/test/interface/fake.go

libgo/MERGE

libgo/Makefile.am

libgo/Makefile.in

libgo/go/exp/datafmt/datafmt.go

libgo/go/exp/datafmt/datafmt_test.go

libgo/go/exp/datafmt/parser.go

libgo/go/fmt/fmt_test.go

libgo/go/fmt/print.go

libgo/go/go/ast/print_test.go

libgo/go/image/draw/draw.go

libgo/go/image/image.go

libgo/go/reflect/all_test.go

libgo/go/reflect/deepequal.go

libgo/go/reflect/value.go