Dereference staged Qt static archives

ober

fcc4dd54767e23b2fbf9eeda5e03bdcd4ce1be41

diff --git a/Dockerfile.qt b/Dockerfile.qt
index 8eb6882..fa9e14a 100644
--- a/Dockerfile.qt
+++ b/Dockerfile.qt
@@ -234,7 +234,7 @@ RUN mkdir -p /opt/qt-static-deps/lib && \
       libxcb-xfixes.a libxcb-render.a libxcb-shape.a libxcb-xkb.a \
       libxcb.a libX11-xcb.a libX11.a; do \
         test -f "/usr/lib/$lib" || { echo "missing static Qt dependency: $lib" >&2; exit 1; }; \
-        cp -a "/usr/lib/$lib" /opt/qt-static-deps/lib/; \
+        cp -L "/usr/lib/$lib" "/opt/qt-static-deps/lib/$lib"; \
     done
 
 # ── Stage 1.5: Compile libqt_shim.a with musl-compatible Alpine g++ ──────────