Move tidy check to mingw-check

Author: JohnTitor

src/ci/docker/mingw-check/Dockerfile

@@ -25,4 +25,5 @@ ENV RUN_CHECK_WITH_PARALLEL_QUERIES 1
 ENV SCRIPT python2.7 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu && \
            python2.7 ../x.py build --stage 0 src/tools/build-manifest && \
            python2.7 ../x.py test --stage 0 src/tools/compiletest && \
+           python2.7 ../x.py test src/tools/tidy && \
            /scripts/validate-toolstate.sh

src/ci/docker/x86_64-gnu-llvm-7/Dockerfile

@@ -28,7 +28,7 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
-ENV SCRIPT python2.7 ../x.py test src/tools/tidy && python2.7 ../x.py test
+ENV SCRIPT python2.7 ../x.py test --exclude src/tools/tidy && python2.7 ../x.py test src/tools/tidy
 
 # The purpose of this container isn't to test with debug assertions and
 # this is run on all PRs, so let's get speedier builds by disabling these extra