use void pointers, not char ones, in socket IO functions

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57546 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/socket.h

@@ -252,8 +252,8 @@ public:
     // IO operations
     // -------------
 
-    virtual int Read(char *buffer, int size) = 0;
-    virtual int Write(const char *buffer, int size) = 0;
+    virtual int Read(void *buffer, int size) = 0;
+    virtual int Write(const void *buffer, int size) = 0;
 
     wxSocketEventFlags Select(wxSocketEventFlags flags);