Test citool on CI

Author: Kobzol

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -69,4 +69,5 @@ ENV SCRIPT \
            eslint -c ../src/librustdoc/html/static/.eslintrc.js ../src/librustdoc/html/static/js/*.js && \
            eslint -c ../src/tools/rustdoc-js/.eslintrc.js ../src/tools/rustdoc-js/tester.js && \
            eslint -c ../src/tools/rustdoc-gui/.eslintrc.js ../src/tools/rustdoc-gui/tester.js && \
-           tsc --project ../src/librustdoc/html/static/js/tsconfig.json
+           tsc --project ../src/librustdoc/html/static/js/tsconfig.json && \
+           cargo test --manifest-path src/ci/citool/Cargo.toml