Update Go library to r60.

gcc/testsuite/go.test/go-test.exp

gcc/testsuite/go.test/test/chan/select5.go

gcc/testsuite/go.test/test/fixedbugs/bug243.go

gcc/testsuite/go.test/test/mallocrep.go

gcc/testsuite/go.test/test/mallocrep1.go

libgo/MERGE

libgo/Makefile.am

libgo/Makefile.in

libgo/config.h.in

libgo/configure

libgo/configure.ac

libgo/go/archive/tar/reader.go

libgo/go/archive/tar/reader_test.go

libgo/go/archive/zip/reader.go

libgo/go/archive/zip/reader_test.go

libgo/go/archive/zip/struct.go

libgo/go/archive/zip/writer.go

libgo/go/archive/zip/writer_test.go

libgo/go/archive/zip/zip_test.go

libgo/go/asn1/asn1.go