Fix macOS memory leaks, also avoid false positive warnings from clang analyzer

__clang_analyzer__ is a constant that only is defined during analyze build, this helps avoiding false positives as long as there is no specific way to silence analyzer messages

src/osx/cocoa/window.mm

@@ -3563,12 +3563,15 @@ bool wxWidgetCocoaImpl::EnableTouchEvents(int eventsMask)
             }
             else // We do want to have gesture events.
             {
+                // clang does not see that the owning object always destroys its extra field
+#ifndef __clang_analyzer__
                 wxCocoaGestures::StoreForObject
                 (
                     this,
                     new wxCocoaGesturesImpl(this, m_osxView, eventsMask)
                 );
-
+#endif
+                
                 [m_osxView setAcceptsTouchEvents:YES];
             }