Port of gccgo to GNU/Hurd

[Svante Signell]

Hello,

As advised by the Debian gcc maintainer Matthias Klose and golang
developer Ian Lance Taylor (Cc:ed)Â I'm (re-)submitting the patches for
the port of gccgo to GNU/Hurd.

The 13 patches are:
src_gcc_config_i386_gnu.h.diff
src_libgo_build.diff
src_libgo_go_crypto.diff
src_libgo_go_go_build_syslist.go.diff
src_libgo_go_net.diff
src_libgo_go_os.diff
src_libgo_go_runtime.diff
src_libgo_go_syscall.diff
src_libgo_go_syscall_syscall_gnu_test.go.diff
src_libgo_runtime.diff
src_libgo_testsuite_gotest.diff
add-gnu-to-libgo-headers.diff
add-gnu-to-libgo-test-headers.diff

Preliminary ChangeLog entries are included in each patch.

With them the latest the latest Debian gcc-snapshot (20181019-1) has
been successfully built. Test results for libgo and go:

                === libgo Summary ===

# of expected passes            162
# of unexpected failures        21

                === go Summary ===

# of expected passes            7394
# of unexpected failures        10
# of expected failures          1
# of untested testcases         7
# of unsupported tests          2

Thanks!
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