Add test support for x86_64-linux-android

ci/android-install-sdk.sh

@@ -37,6 +37,10 @@ case "$1" in
     abi=x86
     ;;
 
+  x86_64)
+    abi=x86_64
+    ;;
+
   *)
     echo "invalid arch: $1"
     exit 1

ci/docker/x86_64-linux-android/Dockerfile

@@ -0,0 +1,32 @@
+FROM ubuntu:16.04
+
+RUN dpkg --add-architecture i386 && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+  file \
+  curl \
+  ca-certificates \
+  python \
+  unzip \
+  expect \
+  openjdk-9-jre \
+  libstdc++6:i386 \
+  libpulse0 \
+  gcc \
+  libc6-dev
+
+WORKDIR /android/
+COPY android* /android/
+
+ENV ANDROID_ARCH=x86_64
+ENV PATH=$PATH:/android/ndk-$ANDROID_ARCH/bin:/android/sdk/tools:/android/sdk/platform-tools
+
+RUN sh /android/android-install-ndk.sh $ANDROID_ARCH
+RUN sh /android/android-install-sdk.sh $ANDROID_ARCH
+RUN mv /root/.android /tmp
+RUN chmod 777 -R /tmp/.android
+RUN chmod 755 /android/sdk/tools/* /android/sdk/tools/qemu/linux-x86_64/*
+
+ENV PATH=$PATH:/rust/bin \
+    CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER=x86_64-linux-android-gcc \
+    HOME=/tmp

ci/run.sh

@@ -105,7 +105,7 @@ case "$TARGET" in
 esac
 
 case "$TARGET" in
-  arm-linux-androideabi | aarch64-linux-android | i686-linux-android)
+  arm-linux-androideabi | aarch64-linux-android | i686-linux-android | x86_64-linux-android)
     # set SHELL so android can detect a 64bits system, see
     # http://stackoverflow.com/a/41789144
     # https://issues.jenkins-ci.org/browse/JENKINS-26930?focusedCommentId=230791&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-230791