[PATCH] gccgo patch 0-2 (9)

[Svante Signell]

Hi,

Attached are patches to enable gccgo to build properly on Debian
GNU/Hurd on gcc-4.7 (4.7.3-4).

patch0.diff: debian/rules.defs: go_no_systems: remove gnu, with_go:
Check for DEB_TARGET_GNU_OS instead of DEB_TARGET_GNU_SYSTEM since that
triggers a disabled build with kfreebsd-gnu.

patch1.diff: src/libgo/runtime/proc.c: Workaround: enable code for 
!SETCONTEXT_CLOBBERS_TLS

patch2.diff: src/libgo/configure.ac: add support for gnu, new variable
LIBGO_IS_GNU

patch0.diff
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patch1.diff
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patch2.diff
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