Hurd port for gcc go PATCH 7-9 (9)

[Svante Signell]

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patch7.diff: src/libgo/go/syscall/wait.c
Set WCONTINUED to zero if not defined (same fix as for lto in gcc-4.9)

patch8.diff: src/libgo/mksysinfo.sh
Add special treatment of EWOULDBLOCK, SYS_FCNTL and st_dev since they
are either not defined or defined differently for the script to catch
them. 

patch9.diff: src/libgo/runtime/netpoll.goc
Rename errno to errno1 since errno clashes with <errno.h> included in
that file on Hurd.

patch7.diff
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patch8.diff
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patch9.diff
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