use struct timeval and not a long to store socket timeout under Unix too

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56940 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gsocket.h

@@ -37,6 +37,8 @@ class WXDLLIMPEXP_FWD_NET wxSocketBase;
 #include <stdlib.h>
 #endif
 
+#include <time.h>       // for timeval
+
 enum GAddressType
 {
   GSOCK_NOFAMILY = 0,
@@ -215,11 +217,7 @@ public:
     bool m_broadcast;
     bool m_dobind;
 
-#ifdef __WINDOWS__
     struct timeval m_timeout;
-#else
-    unsigned long m_timeout;
-#endif
 
     GSocketEventFlags m_detected;