Hurd port for gcc go PATCH 0-3 (9)

[Svante Signell]

Hi,

Attached are patches to enable gccgo to build properly on Debian
GNU/Hurd on gcc-4.9 (4.9-20140406). With split stack disabled around 70
libgo tests PASS and 50 FAIL (result seems to be somewhat random,
alignment problems there too?). With split stack enabled _all_ tests
fail, see
https://lists.gnu.org/archive/html/bug-hurd/2013-06/msg00100.html

patch0.diff is Debian specific, patch1.diff should be applied when
split-stack works properly while the rest are available for upstream.

patch0.diff: debian/rules.defs:
go_no_systems: remove gnu,
with_go: Check for DEB_TARGET_GNU_OS instead of DEB_TARGET_GNU_SYSTEM.
Otherwise kfreebsd-gnu causes go_no_systems to still be true for gnu.

patch1.diff: src/gcc/config/i386/gnu.h:
Enables split stack for GNU/Hurd. Until split-stack works properly with
the pthread library of Hurd this patch should not be applied. Maybe the
offsets should change, but that has to be synchronized with the
src/libgcc/config/i386/morestack.S assembly routine (unfortunately asm
is not my piece of cake).

patch2.diff: src/libgo/configure.ac:
Add GNU as a supported target OS for go.

patch3.diff: src/libgo/Makefile.am, src/libgo/Makefile.in
Add GNU specific go routines with the LIBGO_IS_GNU conditional.

Note: Creating the Makefile.in is hard (unnecessary) work since automake
is no longer used in the build system. 
Both (cd src/libgo;automake-1.11) and (cd src/libgo;autoreconf2.64)
fails. The diff for Makefile.in has to be patched by hand with the aid
of the diff for Makefile.am :( This file should be possible to generate
from Makefile.am when modifying manually. In my opinion the build system
is broken wrt libgo.

patch0.diff
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patch1.diff
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patch2.diff
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patch3.diff
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