hw/xwin: Remove unused X includes from internal.h and add them where needed

Also removing server headers we might clash with and no longer need.  Make
a few adjustments to allow for this change:

- provide a prototype of ErrorF()
- use the MAX() macro provided by sys/param.h, not the max() macro provided by misc.h
- use the X 'Bool' type rather than the unwrapped Windows 'BOOL' type

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>

hw/xwin/winclipboard/wndproc.c

@@ -37,8 +37,9 @@
 #include <sys/types.h>
 #include <sys/time.h>
 
+#include <X11/Xatom.h>
+
 #include "internal.h"
-#include "misc.h"
 #include "winclipboard.h"
 
 /*
@@ -499,7 +500,7 @@ winClipboardWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
  * Process any pending Windows messages
  */
 
-BOOL
+Bool
 winClipboardFlushWindowsMessageQueue(HWND hwnd)
 {
     MSG msg;