macOS Accessibility: Silence some unguarded-selector warnings

modules/juce_gui_basics/native/accessibility/juce_mac_Accessibility.mm

@@ -41,6 +41,8 @@ namespace juce
 
 #define JUCE_NATIVE_ACCESSIBILITY_INCLUDED 1
 
+JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wunguarded-availability", "-Wunguarded-availability-new")
+
 //==============================================================================
 class AccessibilityHandler::AccessibilityNativeImpl
 {
@@ -944,6 +946,8 @@ void AccessibilityHandler::postAnnouncement (const String& announcementString, A
      }
 }
 
+JUCE_END_IGNORE_WARNINGS_GCC_LIKE
+
 #endif
 
 } // namespace juce

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -2146,9 +2146,9 @@ private:
         return [getAccessibleChild (self) accessibilityFocusedUIElement];
     }
 
-    static BOOL getAccessibilityIsIgnored (id self, SEL)
+    static BOOL getAccessibilityIsIgnored (id, SEL)
     {
-        return ! [self isAccessibilityElement];
+        return YES;
     }
 
     static id getAccessibilityAttributeValue (id self, SEL, NSString* attribute)
@@ -2386,7 +2386,10 @@ private:
 
     static NSAccessibilityRole getAccessibilitySubrole (id self, SEL)
     {
-        return [getAccessibleChild (self) accessibilitySubrole];
+        if (@available (macOS 10.10, *))
+            return [getAccessibleChild (self) accessibilitySubrole];
+
+        return nil;
     }
 };