Update toolchain to build NetBSD release

This allows us to remove the "allow old toolchains" flag we pass to
LLVM, ensuring that we'll be up to date when LLVM needs us to be!

src/ci/docker/dist-x86_64-netbsd/Dockerfile

@@ -3,23 +3,8 @@ FROM ubuntu:16.04
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
 
-# Ubuntu 16.04 (this container) ships with make 4, but something in the
-# toolchains we build below chokes on that, so go back to make 3
-COPY scripts/make3.sh /scripts/
-RUN sh /scripts/make3.sh
-
-COPY scripts/crosstool-ng.sh /scripts/
-RUN sh /scripts/crosstool-ng.sh
-
-COPY scripts/rustbuild-setup.sh /scripts/
-RUN sh /scripts/rustbuild-setup.sh
-USER rustbuild
-WORKDIR /tmp
-
 COPY dist-x86_64-netbsd/build-netbsd-toolchain.sh /tmp/
-RUN ./build-netbsd-toolchain.sh
-
-USER root
+RUN /tmp/build-netbsd-toolchain.sh
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
@@ -33,6 +18,5 @@ ENV \
 
 ENV HOSTS=x86_64-unknown-netbsd
 
-ENV RUST_CONFIGURE_ARGS --enable-extended --disable-docs \
-  --set llvm.allow-old-toolchain
+ENV RUST_CONFIGURE_ARGS --enable-extended --disable-docs
 ENV SCRIPT python2.7 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/dist-x86_64-netbsd/build-netbsd-toolchain.sh

@@ -28,15 +28,15 @@ mkdir -p /x-tools/x86_64-unknown-netbsd/sysroot
 URL=https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror
 
 # Originally from ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-$BSD/source/sets/*.tgz
-curl $URL/2017-03-17-netbsd-src.tgz | tar xzf -
-curl $URL/2017-03-17-netbsd-gnusrc.tgz | tar xzf -
-curl $URL/2017-03-17-netbsd-sharesrc.tgz | tar xzf -
-curl $URL/2017-03-17-netbsd-syssrc.tgz | tar xzf -
+curl $URL/2018-03-01-netbsd-src.tgz | tar xzf -
+curl $URL/2018-03-01-netbsd-gnusrc.tgz | tar xzf -
+curl $URL/2018-03-01-netbsd-sharesrc.tgz | tar xzf -
+curl $URL/2018-03-01-netbsd-syssrc.tgz | tar xzf -
 
 # Originally from ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-$BSD/amd64/binary/sets/*.tgz
-curl $URL/2017-03-17-netbsd-base.tgz | \
+curl $URL/2018-03-01-netbsd-base.tgz | \
   tar xzf - -C /x-tools/x86_64-unknown-netbsd/sysroot ./usr/include ./usr/lib ./lib
-curl $URL/2017-03-17-netbsd-comp.tgz | \
+curl $URL/2018-03-01-netbsd-comp.tgz | \
   tar xzf - -C /x-tools/x86_64-unknown-netbsd/sysroot ./usr/include ./usr/lib
 
 cd usr/src