Added option SW_FORCEMINIMIZE to ShowWindow.

diff --git a/dlls/x11drv/winpos.c b/dlls/x11drv/winpos.c
index b72eeb2..567e7bc 100644
--- a/dlls/x11drv/winpos.c
+++ b/dlls/x11drv/winpos.c
@@ -1178,6 +1178,7 @@
             swp |= SWP_NOACTIVATE | SWP_NOZORDER;
             /* fall through */
 	case SW_SHOWMINIMIZED:
+        case SW_FORCEMINIMIZE: /* FIXME: Does not work if thread is hung. */
             swp |= SWP_SHOWWINDOW;
             /* fall through */
 	case SW_MINIMIZE:
diff --git a/include/winuser.h b/include/winuser.h
index c3b8354..a9cf02b 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2871,7 +2871,8 @@
 #define SW_SHOWNA           8
 #define SW_RESTORE          9
 #define SW_SHOWDEFAULT	    10
-#define SW_MAX		    10
+#define SW_FORCEMINIMIZE    11
+#define SW_MAX              11
 #define SW_NORMALNA	    0xCC	/* undoc. flag in MinMaximize */
 
   /* WM_SIZE message wParam values */