Update: Hurd port for gcc-7 go : 7.3.0-8+ for glibc 2.26+

[Svante Signell]

Hi,

Attached is the updated patch, src_libgo_build.diff, to build gccgo properly on
Debian GNU/Hurd on gcc-7 (7-7.3.0-{8,9,10}) again after the update of glibc to
2.26+

The libgo tests show the following:

                === libgo Summary ===

# of expected passes            119
# of unexpected failures        26

Replacing the stub code of netpoll_gnu.go with a poll-based implementation the
libgo tests improves to:

                === libgo Summary ===

# of expected passes            124
# of unexpected failures        21

The change is reflected in the updated version of src_libgo_go_runtime.diff,
also attached!

Thanks!

src_libgo_build.diff
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src_libgo_go_runtime.diff
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