ReleaseCapture() is supposed to return a BOOL value.

diff --git a/include/winuser.h b/include/winuser.h
index aa66ced..0a9e31d 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2825,7 +2825,7 @@
 DWORD       WINAPI GetTickCount(void);
 ATOM        WINAPI GlobalDeleteAtom(ATOM);
 DWORD       WINAPI OemKeyScan(WORD);
-VOID        WINAPI ReleaseCapture(void);
+BOOL        WINAPI ReleaseCapture(void);
 VOID        WINAPI SetKeyboardState(LPBYTE);
 VOID        WINAPI WaitMessage(VOID);