macOS: Application bundle fixes.

Copy Sparkle.framework correctly. Force signing so that we replace
Sparkle's signature with ours.

In osx-app.sh, don't sign a file or framework if it's already signed.

Fix the osx-dmg.sh usage message while we're here.

Change-Id: I697073d234958e1d8386650935a132237ad88f64
Reviewed-on: https://code.wireshark.org/review/35095
Reviewed-by: Gerald Combs <gerald@wireshark.org>

packaging/macosx/osx-app.sh.in

@@ -231,7 +231,7 @@ fi
 /usr/bin/install_name_tool -delete_rpath "$qt_frameworks_dir" $pkgexec/Wireshark
 
 if [ -d "$sparkle_frameworks_dir" ] ; then
-	cp -r "$sparkle_frameworks_dir" "$pkglib" || exit 1
+	cp -R "$sparkle_frameworks_dir" "$pkglib" || exit 1
 fi
 
 # NOTE: we must rpathify *all* files, *including* Qt libraries etc.,
@@ -466,6 +466,7 @@ codesign_file () {
 	# https://developer.apple.com/documentation/security/hardened_runtime_entitlements?language=objc
 	codesign \
 		--sign "Developer ID Application: $CODE_SIGN_IDENTITY" \
+		--force \
 		--options runtime \
 		--entitlements "@CMAKE_SOURCE_DIR@/packaging/macosx/entitlements.plist" \
 		--timestamp \

packaging/macosx/osx-dmg.sh.in

@@ -23,7 +23,7 @@ OPTIONS
 		Display this help message.
 
 Icons are positioned and the background image is set in
-arrange_dmg.applescript.
+dmgbuild-settings.py.in.
 "
 }