update mingw-check clippy invocation

Previously this command was linting compiler and library together.
As we no longer run clippy on the entire tree unless it's explicitly
requested, we need to update this command by adding `library` path.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

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

@@ -46,7 +46,7 @@ ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
            # We also skip the x86_64-unknown-linux-gnu target as it is well-tested by other jobs.
            python3 ../x.py check --stage 0 --set build.optimized-compiler-builtins=false core alloc std --target=aarch64-unknown-linux-gnu,i686-pc-windows-msvc,i686-unknown-linux-gnu,x86_64-apple-darwin,x86_64-pc-windows-gnu,x86_64-pc-windows-msvc && \
            python3 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu && \
-           python3 ../x.py clippy compiler -Aclippy::all -Dclippy::correctness && \
+           python3 ../x.py clippy compiler library -Aclippy::all -Dclippy::correctness && \
            python3 ../x.py build --stage 0 src/tools/build-manifest && \
            python3 ../x.py test --stage 0 src/tools/compiletest && \
            python3 ../x.py test --stage 0 core alloc std test proc_macro && \