unix: update Dockerfile to go 1.9.2

Update go to 1.9.2 in the Dockerfile used to generate the Linux go files.

The update also changes some zerror definitions: RLIM_INFINITY is
assigned to Rlimit.{Cur,Max} which are both uint64 on all architectures.
PR_SET_PTRACER_ANY is used with Prctl which expects an uintptr.

With the current version, an "constant -1 overflows uint64" error would
result if these constants were used directly without type conversion.

Change-Id: Iefd23a44e983b4fcf210121776531df225014112
Reviewed-on: https://go-review.googlesource.com/73873
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/linux/Dockerfile

@@ -17,10 +17,10 @@ RUN git clone --branch v4.13 --depth 1 https://kernel.googlesource.com/pub/scm/l
 # GNU C library: Released 02 Aug 2017 (we should try to get a secure way to clone this)
 RUN git clone --branch glibc-2.26 --depth 1 git://sourceware.org/git/glibc.git
 
-# Get Go 1.8 (https://github.com/docker-library/golang/blob/master/1.8/Dockerfile)
-ENV GOLANG_VERSION 1.8
+# Get Go 1.9.2
+ENV GOLANG_VERSION 1.9.2
 ENV GOLANG_DOWNLOAD_URL https://golang.org/dl/go$GOLANG_VERSION.linux-amd64.tar.gz
-ENV GOLANG_DOWNLOAD_SHA256 53ab94104ee3923e228a2cb2116e5e462ad3ebaeea06ff04463479d7f12d27ca
+ENV GOLANG_DOWNLOAD_SHA256 de874549d9a8d8d8062be05808509c09a88a248e77ec14eb77453530829ac02b
 
 RUN curl -fsSL "$GOLANG_DOWNLOAD_URL" -o golang.tar.gz \
     && echo "$GOLANG_DOWNLOAD_SHA256  golang.tar.gz" | sha256sum -c - \
@@ -33,7 +33,7 @@ ENV PATH /usr/local/go/bin:$PATH
 RUN apt-get update && apt-get install -y \
         gawk make python \
         gcc gcc-multilib \
-        gettext  texinfo \
+        gettext texinfo \
     && rm -rf /var/lib/apt/lists/*
 # Emulator and cross compilers
 RUN apt-get update && apt-get install -y \