updated for version 7.4a.037
Problem:    Win32: When mouse is hidden and in the toolbar, moving it won't
            make it appear. (Sami Salonen)
Solution:   Add tabline_wndproc() and toolbar_wndproc(). (Ken Takata)
diff --git a/src/gui_w48.c b/src/gui_w48.c
index 8097fb9..4458bde 100644
--- a/src/gui_w48.c
+++ b/src/gui_w48.c
@@ -177,10 +177,12 @@
 
 #ifdef FEAT_TOOLBAR
 static HWND		s_toolbarhwnd = NULL;
+static WNDPROC		s_toolbar_wndproc = NULL;
 #endif
 
 #ifdef FEAT_GUI_TABLINE
 static HWND		s_tabhwnd = NULL;
+static WNDPROC		s_tabline_wndproc = NULL;
 static int		showing_tabline = 0;
 #endif