macOS: Fix Objective-C namespaceing with Xcode 10

Xcode 10 ships version 921.0.1 of cctools, which otool is part of. The
defaults have changed in that version to no longer print verbosely
(symbolically), which we relied on. We now request it explicitly.

Change-Id: Ifbe0c97462b9f78cf128c820847eff9c72f17065
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Tim Blechmann <tim@klingt.org>

mkspecs/features/data/mac/objc_namespace.sh

@@ -146,7 +146,7 @@ inspect_binary() {
         echo "found namespaced class names, updating class entries..."
     fi
 
-    classes=$(otool -o "$target" | grep class_ro_t)
+    classes=$(otool -o -v "$target" | grep class_ro_t)
     while read -a class; do
         address="$(sanitize_address ${class[1]})"