fix macOS 15.4 beta crashes due to LC_RPATH dups

Fixes the UG crashes caused by the multiplication of
"@executable_path/../libs/" caused by replacing multiple (originally
distinct) LC_RPATH values with this one.

+ removed invalid comment from Makefile (actually was related to
"bundle-nolib" target that is no longer present)

closes GH-436

Author: MartinPulec

Makefile.in

@@ -573,7 +573,6 @@ release:
 hd-rum-multi/hd-rum:
 	make -C hd-rum-multi
 
-# Makes dummy bundle (almost empty). May not be portable due to missing libs.
 $(BUNDLE): $(TARGET) $(REFLECTOR_TARGET) @MANPAGES@ hd-rum-multi/hd-rum
 	rm -rf $(BUNDLE)
 	$(MKDIR_P) $(BUNDLE)/Contents/MacOS $(BUNDLE)/Contents/libs
@@ -587,6 +586,7 @@ $(BUNDLE): $(TARGET) $(REFLECTOR_TARGET) @MANPAGES@ hd-rum-multi/hd-rum
 			| $(DYLIBBUNDLER) $(DYLIBBUNDLER_FLAGS) -of -cd -b \
 				-d $(BUNDLE)/Contents/libs/ -p @executable_path/../libs/ -x $$n; \
 	done
+	$(srcdir)/data/scripts/macos_fix_multiple_rpaths.sh $(BUNDLE)
 	if [ -d Frameworks ]; then $(CP) -R Frameworks $(BUNDLE)/Contents/; fi
 	if [ -n '@MANPAGES@' ]; then mkdir -p $(BUNDLE)/Contents/man/man1; \
 		$(CP) @MANPAGES@ $(BUNDLE)/Contents/man/man1/; fi

data/scripts/macos_fix_multiple_rpaths.sh

@@ -0,0 +1,26 @@
+#!/bin/sh -eu
+#
+## Remove multiple LC_RPATH occurences of @executable_path/../libs/
+## as can be seen by cmd `otool -l $lib | grep -B 1 -A 2 LC_RPATH`
+## which seem to be refused by dyld since macOS 15.4 as can be seen
+## here <https://github.com/CESNET/UltraGrid/issues/436>. The multiplied
+## paths are caused by dylibbundler LC_RPATH replacements.
+##
+## @param $1 bundle path
+
+rpath=@executable_path/../libs/
+
+# output number of $rpath occurences in 'cmd LC_RPATH'
+num_rel_lc_rpath() {
+        otool -l "$1" | sed -n '/LC_RPATH/,+2p' | grep -c "$rpath" || true
+}
+
+find "$1" -type f -print0 |
+        while IFS= read -r -d '' n; do
+                count=$(num_rel_lc_rpath "$n")
+                # remove all but at most one LC_RPATH $path occurences
+                while [ "$count" -gt 1 ]; do
+                        install_name_tool -delete_rpath "$rpath" "$n"
+                        count=$((count - 1))
+                done
+        done