New upstream version 2018.6

rust/vendor/libc/ci/docker/x86_64-unknown-linux-musl/Dockerfile

@@ -0,0 +1,20 @@
+FROM ubuntu:17.10
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
+  gcc make libc6-dev git curl ca-certificates
+RUN curl https://www.musl-libc.org/releases/musl-1.1.15.tar.gz | \
+    tar xzf - && \
+    cd musl-1.1.15 && \
+    ./configure --prefix=/musl-x86_64 && \
+    make install -j4 && \
+    cd .. && \
+    rm -rf musl-1.1.15 && \
+# Install linux kernel headers sanitized for use with musl
+    curl -L  https://github.com/sabotage-linux/kernel-headers/archive/v3.12.6-5.tar.gz | \
+    tar xzf - && \
+    cd kernel-headers-3.12.6-5 && \
+    make ARCH=x86_64 prefix=/musl-x86_64 install -j4 && \
+    cd .. && \
+    rm -rf kernel-headers-3.12.6-5
+ENV PATH=$PATH:/musl-x86_64/bin:/rust/bin