Added SetUserObjectSecurity.

diff --git a/include/winuser.h b/include/winuser.h
index e0a2439..f40f127 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -3709,6 +3709,7 @@
 BOOL      WINAPI SetSystemMenu(HWND,HMENU);
 UINT      WINAPI SetSystemTimer(HWND,UINT,UINT,TIMERPROC);
 UINT      WINAPI SetTimer(HWND,UINT,UINT,TIMERPROC);
+BOOL        WINAPI SetUserObjectSecurity(HANDLE,PSECURITY_INFORMATION,PSECURITY_DESCRIPTOR);
 LONG        WINAPI SetWindowLongA(HWND,INT,LONG);
 LONG        WINAPI SetWindowLongW(HWND,INT,LONG);
 #define     SetWindowLong WINELIB_NAME_AW(SetWindowLong)