Drop miri cross-compile check for Windows

Author: Mark-Simulacrum

src/ci/docker/host-x86_64/x86_64-gnu-tools/checktools.sh

@@ -27,6 +27,10 @@ python3 "$X_PY" test --stage 2 src/tools/rustfmt
 python3 "$X_PY" test --stage 2 src/tools/miri
 # We natively run this script on x86_64-unknown-linux-gnu and x86_64-pc-windows-msvc.
 # Also cover some other targets (on both of these hosts) via cross-testing.
-python3 "$X_PY" test --stage 2 src/tools/miri --target i686-pc-windows-msvc
+#
+# Currently disabled -- we end up pulling in a cross-compile of LLVM (maybe
+# just overly eager sanity checks), but in any case this won't work when
+# building LLVM as of this comment.
+#python3 "$X_PY" test --stage 2 src/tools/miri --target i686-pc-windows-msvc
 #FIXME(https://github.com/rust-lang/rust/issues/103519): macOS testing is currently disabled
 # python3 "$X_PY" test --stage 2 src/tools/miri --target aarch64-apple-darwin