Fixup some previous configuration errors.

Author: kennytm

appveyor.yml

@@ -28,7 +28,7 @@ environment:
   # MSVC tools tests
   - MSYS_BITS: 64
     SCRIPT: src/ci/docker/x86_64-gnu-tools/checktools.sh x.py toolstates.json
-    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --save-toolstates=toolstates.json
+    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --save-toolstates=toolstates.json --enable-test-miri
 
   # 32/64-bit MinGW builds.
   #

src/ci/docker/x86_64-gnu-aux/Dockerfile

@@ -21,5 +21,5 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --enable-test-miri
+ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check-aux

src/ci/docker/x86_64-gnu-tools/Dockerfile

@@ -19,5 +19,8 @@ RUN sh /scripts/sccache.sh
 
 COPY x86_64-gnu-tools/checktools.sh /tmp/
 
-ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --save-toolstates=/tmp/toolstates.json
+ENV RUST_CONFIGURE_ARGS \
+  --build=x86_64-unknown-linux-gnu \
+  --enable-test-miri \
+  --save-toolstates=/tmp/toolstates.json
 ENV SCRIPT /tmp/checktools.sh ../x.py /tmp/toolstates.json