Force linking of src/osx/core/sockosx.cpp.

Without this the file was omitted by linker entirely in the static build and
the correct socket manager wasn't used for the GUI applications (see #11030).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61689 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/socket.cpp

@@ -2079,4 +2079,9 @@ wxFORCE_LINK_MODULE( socketiohandler )
     wxFORCE_LINK_MODULE( mswsocket )
 #endif
 
+// and for OSXManagerSetter in the OS X one
+#ifdef __WXMAC__
+    wxFORCE_LINK_MODULE( osxsocket )
+#endif
+
 #endif // wxUSE_SOCKETS