define TTF_TRANSPARENT if it's absent from SDK headers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@49520 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/tooltip.cpp

@@ -41,6 +41,10 @@
     #define TTTOOLINFO_V1_SIZE 0x28
 #endif
 
+#ifndef TTF_TRANSPARENT
+    #define TTF_TRANSPARENT 0x0100
+#endif
+
 // VZ: normally, the trick with subclassing the tooltip control and processing
 //     TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
 //     code here for now (but it's not compiled) in case we need it later.
@@ -97,12 +101,11 @@ public:
         // then as the control gets "focus lost" events and dismisses the
         // tooltip which then reappears because mouse remains hovering over the
         // control, see SF patch 1821229
-#ifndef __DMC__        
         if ( wxApp::GetComCtl32Version() >= 470 )
         {
             uFlags |= TTF_TRANSPARENT;
         }
-#endif
+
         uId = (UINT)hwndOwner;
     }
 };