Hopefully finish removing the old wxCocoa port.

Get rid of the rest of __WXCOCOA__ tests in the sources.

Drop configure option for using it.

Also remove the documentation for this port.

This should have also been part of r76735.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76815 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -577,7 +577,7 @@ long wxExecute(char **argv, int flags, wxProcess *process,
                     wxT("wxExecute() can be called only from the main thread") );
 #endif // wxUSE_THREADS
 
-#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
+#ifdef __DARWIN__
     // wxMacLaunch() only executes app bundles and only does it asynchronously.
     // It returns false if the target is not an app bundle, thus falling
     // through to the regular code for non app bundles.