Retain symlinks upon making universal macos binaries

Saving symlinks is important when we build dynamic libs,
it will be needed for building QtMM + dynamic ffmpeg.

Pick-to: 6.6 6.5
Change-Id: Ic356a9c3df727a1afe14e8553728952d3b106ba3
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
(cherry picked from commit a3c489b272)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

coin/provisioning/common/macos/makeuniversal.sh

@@ -4,16 +4,22 @@
 
 # Copies or lipos files from the given DESTDIR dirs to the respective install dir
 
-set -e
+set -x
 
 for dir in "$@"; do
     echo "Processing files in $dir ..."
     pushd "$dir" >/dev/null
-    find . -type f | while read -r f; do
+    find . -type f -or -type l | while read -r f; do
         dst="${f:1}"
         dstdir="$(dirname "$dst")"
         mkdir -p "$dstdir"
-        if [[ ! -f "$dst" ]]; then
+
+        if [[ -L "$f" ]]; then
+            if [[ ! -L "$dst" ]]; then
+                echo "Copying symlink $dir/$f to $dst"
+                cp -P -n "$f" "$dst"
+            fi
+        elif [[ ! -f "$dst" ]]; then
             echo "Copying $dir/$f to $dst"
             cp -c "$f" "$dst"
         elif lipo -info "$f" >/dev/null 2>&1; then