mk_pypack_macos.zsh: fix copy statement

devtools/deploy/mac/mk_pypack_macos.zsh.in

@@ -317,7 +317,7 @@ done
 echo "$TITLE: Copying external dependencies to '$xlibdir'..."
 
 for pth fnm in ${(@kv)ex_deps}; do
-    cp -nf "$pth" "$xlibdir/$fnm"
+    cp -fL "$pth" "$xlibdir/$fnm"
 done
 
 # report the external libraries