fix sh

Author: tgross35

ci/run-windows.sh

@@ -7,8 +7,8 @@ target="$1"
 m4 --help
 make --help
 
-curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs |
-    sh --default-toolchain nightly-x86_64-gnu \
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -- \
+    --default-toolchain nightly-x86_64-gnu \
     --target "$target" \
 
 cargo -vV