Remove old checks

AW_XXX <https://msdn.microsoft.com/en-us/library/windows/desktop/ms632669(v=vs.85).aspx>
MAPVK_VK_TO_CHAR <https://msdn.microsoft.com/en-us/library/windows/desktop/ms646307(v=vs.85).aspx>
TME_LEAVE <https://msdn.microsoft.com/en-us/library/windows/desktop/ms645604(v=vs.85).aspx>
WM_MOUSELEAVE <https://msdn.microsoft.com/en-us/library/windows/desktop/ms645615(v=vs.85).aspx>

src/msw/window.cpp

@@ -121,27 +121,10 @@
     #define ETS_ASSIST          7
 #endif
 
-// define the constants used by AnimateWindow() if our SDK doesn't have them
+#if wxUSE_DYNLIB_CLASS
-#ifndef AW_CENTER
-    #define AW_HOR_POSITIVE 0x00000001
-    #define AW_HOR_NEGATIVE 0x00000002
-    #define AW_VER_POSITIVE 0x00000004
-    #define AW_VER_NEGATIVE 0x00000008
-    #define AW_CENTER       0x00000010
-    #define AW_HIDE         0x00010000
-    #define AW_ACTIVATE     0x00020000
-    #define AW_SLIDE        0x00040000
-    #define AW_BLEND        0x00080000
-#endif
-
-#if defined(TME_LEAVE) && defined(WM_MOUSELEAVE) && wxUSE_DYNLIB_CLASS
     #define HAVE_TRACKMOUSEEVENT
 #endif // everything needed for TrackMouseEvent()
 
-#ifndef MAPVK_VK_TO_CHAR
-    #define MAPVK_VK_TO_CHAR 2
-#endif
-
 // ---------------------------------------------------------------------------
 // global variables
 // ---------------------------------------------------------------------------