Move FreeBSD testing from Travis/QEMU to Cirrus-CI

Fixes #1163

.cirrus.yml

@@ -0,0 +1,14 @@
+freebsd_instance:
+  image: freebsd-11-1-release-amd64
+
+task:
+  # This name gets reported as a build status in GitHub
+  name: stable x86_64-unknown-freebsd
+  setup_script:
+    - pkg install -y curl
+    - curl https://sh.rustup.rs -sSf --output rustup.sh
+    - sh rustup.sh -y
+  test_script:
+    - . $HOME/.cargo/env
+    - cd libc-test
+    - cargo test

.travis.yml

@@ -78,9 +78,6 @@ matrix:
     - env: TARGET=x86_64-unknown-linux-gnux32 OPT="--release"
       rust: nightly
 
-    # QEMU based targets that compile in an emulator
-    - env: TARGET=x86_64-unknown-freebsd
-
     - env: TARGET=wasm32-unknown-unknown
       install: rustup target add $TARGET
       script: cargo build --no-default-features --target $TARGET --release

bors.toml

@@ -0,0 +1,4 @@
+# Gate on both Travis CI and Cirrus-ci
+status = ["continuous-integration/appveyor/branch",
+	  "continuous-integration/travis-ci/push",
+	  "stable x86_64-unknown-freebsd"]

ci/docker/x86_64-unknown-freebsd/Dockerfile

@@ -1,13 +0,0 @@
-FROM wezm/port-prebuilt-freebsd11@sha256:43553e2265ec702ec72a63a765df333f50b1858b896e69385749e96d8624e9b0
-
-RUN apt-get update
-RUN apt-get install -y --no-install-recommends \
-  qemu genext2fs xz-utils
-RUN apt-get install -y curl ca-certificates gcc
-
-ENTRYPOINT ["sh"]
-
-ENV PATH=$PATH:/rust/bin \
-    QEMU=2018-03-15/FreeBSD-11.1-RELEASE-amd64.qcow2.xz \
-    CAN_CROSS=1 \
-    CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_LINKER=x86_64-unknown-freebsd11-gcc