Remove bazel build from Travis.

We already have one on Cirrus, and it works fine.

.travis.yml

@@ -37,23 +37,6 @@ jobs:
             - libvpx-dev            # For toxav.
       install:       .travis/$JOB install
       script:        .travis/$JOB script
-    - stage: "Stage 1"
-      env: JOB=bazel-linux
-      compiler: clang
-      before_install:
-        # Clear bazel installation.
-        - rm -rf $HOME/.cache/bazel/_bazel_$USER/install
-        # Get toktok-stack, which contains the bazel workspace.
-        - cd ..
-        - git clone --depth=1 --branch=upgrade-bazel https://github.com/iphydf/toktok-stack
-        - rm -rf toktok-stack/c-toxcore
-        - mv c-toxcore toktok-stack/
-        - cd toktok-stack/c-toxcore
-      install:       .travis/$JOB install
-      script:        .travis/$JOB script
-      before_cache:
-        # Clear bazel installation.
-        - rm -rf $HOME/.cache/bazel/_bazel_$USER/install
     - stage: "Stage 1"
       if: type IN (push, api, cron)
       env: JOB=cmake-win32

.travis/bazel-linux

@@ -1,35 +0,0 @@
-#!/bin/sh
-
-ACTION="$1"
-
-set -eu
-
-travis_install() {
-  # Get bazel.
-  wget https://github.com/bazelbuild/bazel/releases/download/2.2.0/bazel-2.2.0-installer-linux-x86_64.sh
-  chmod +x bazel-2.2.0-installer-linux-x86_64.sh
-  ./bazel-2.2.0-installer-linux-x86_64.sh --user
-  echo 'build --jobs=4 --curses=no --verbose_failures' >> $HOME/.bazelrc
-  echo 'build --config=linux' >> $HOME/.bazelrc
-  echo "build --config=$CC" >> $HOME/.bazelrc
-  echo "build --config=remote" >> $HOME/.bazelrc
-  pip install --user yamllint
-}
-
-travis_script() {
-  yamllint -c ../tools/project/yamllint.rc .
-  bazel test \
-    //c-toxcore:license_test \
-    //c-toxcore:readme_test
-
-  # TODO(iphydf): Make tests have a chance to succeed.
-  # Run the tests, but if they fail, at least we should be able to build.
-  # bazel test //c-toxcore/... || bazel build //c-toxcore/...
-  bazel build //c-toxcore/...
-}
-
-if [ "-z" "$ACTION" ]; then
-  "travis_script"
-else
-  "travis_$ACTION"
-fi