ANSI C fixes.
Removed warnings.
Made the include files self-sufficient.
Some Solaris fixes.

diff --git a/windows/mdi.c b/windows/mdi.c
index dc603bc..d3fae2d 100644
--- a/windows/mdi.c
+++ b/windows/mdi.c
@@ -23,6 +23,7 @@
 #include "user.h"
 #include "menu.h"
 #include "resource.h"
+#include "scroll.h"
 #include "struct32.h"
 #include "tweak.h"
 #include "debug.h"
@@ -34,8 +35,6 @@
 static HBITMAP16 hBmpClose   = 0;
 static HBITMAP16 hBmpRestore = 0;
 
-INT SCROLL_SetNCSbState(WND*,int,int,int,int,int,int);
-
 /* ----------------- declarations ----------------- */
 static void MDI_UpdateFrameText(WND *, HWND, BOOL, LPCSTR);
 static BOOL MDI_AugmentFrameMenu(MDICLIENTINFO*, WND *, HWND);