Add golang 1.7.3 to dcos base build image

Author: malnick

pkgpanda/docker/dcos-builder/Dockerfile

@@ -15,6 +15,7 @@ RUN apt-get -qq update && apt-get -y install \
   gettext-base \
   git \
   gzip \
+  libc6-dev \
   libapr1-dev \
   libc6-dev \
   libcurl4-openssl-dev \