tweak the extraction

Author: mati865

src/ci/scripts/install-mingw.sh

@@ -55,7 +55,8 @@ if isWindows && isKnownToBeMingwBuild; then
             ;;
         *.zip)
             curl -o mingw.zip "${MIRRORS_BASE}/${mingw_archive}"
-            unzip -d $mingw_dir mingw.zip > /dev/null
+            unzip -q mingw.zip
+            mv llvm-mingw-20251104-ucrt-$arch $mingw_dir
             # Temporary workaround: https://github.com/mstorsjo/llvm-mingw/issues/493
             mkdir -p $mingw_dir/bin
             ln -s $arch-w64-windows-gnu.cfg $mingw_dir/bin/$arch-pc-windows-gnu.cfg