VAAPI-X11: suspend thread cancellation for these routines.

Make sure cancellation does not happen in these routines.

modules/codec/avcodec/vaapi_x11.c

@@ -562,9 +562,11 @@ void CloseVaapiX11(vlc_object_t *obj)
 
 static void Manage(vout_display_t *vd)
 {
+    int canc = vlc_savecancel();
     vout_display_sys_t *sys = vd->sys;
     xcb_connection_t *conn = XGetXCBConnection(sys->x11display);
     ManageEvent(vd, conn, &sys->visible);
+    vlc_restorecancel(canc);
 }
 
 static int Control (vout_display_t *vd, int query, va_list ap)
@@ -784,6 +786,7 @@ static vasubpicture_cache_t *cache_SubpictureCreate(vout_display_t *vd, const su
                                               const subpicture_region_t *region, const int flags)
 {
     vout_display_sys_t *sys = (vout_display_sys_t *) vd->sys;
+    int canc = vlc_savecancel();
 
     sys->conn->lock();
 
@@ -845,6 +848,7 @@ static vasubpicture_cache_t *cache_SubpictureCreate(vout_display_t *vd, const su
     vasub_cache->rect.i_height = region->fmt.i_visible_height;
 
     sys->conn->unlock();
+    vlc_restorecancel(canc);
     return vasub_cache;
 
 cleanup:
@@ -857,6 +861,7 @@ cleanup:
 
 error:
     sys->conn->unlock();
+    vlc_restorecancel(canc);
     return NULL;
 }
 
@@ -886,6 +891,8 @@ static void cache_SubpictureDestroy(vout_display_t *vd, vlc_va_conn_t *conn, sub
         assert(subpic->i_id != VA_INVALID_ID);
         assert(subpic->image.image_id != VA_INVALID_ID);
 
+        int canc = vlc_savecancel();
+
         conn->lock();
 
         vaDestroySubpicture(conn->p_display, subpic->i_id);
@@ -897,6 +904,8 @@ static void cache_SubpictureDestroy(vout_display_t *vd, vlc_va_conn_t *conn, sub
 
         conn->unlock();
 
+        vlc_restorecancel(canc);
+
         subpicture_cache_destroy(subpic);
         subpic = NULL;
     }
@@ -1320,6 +1329,7 @@ static void DisplayPicture(vout_display_t *vd, picture_t *picture, subpicture_t
 {
     vout_display_sys_t *sys = vd->sys;
     int ret = VLC_EGENERIC;
+    int canc = vlc_savecancel();
 
     if (!sys->visible)
         goto out;
@@ -1354,6 +1364,7 @@ out:
     }
 
     picture_Release(picture);
+    vlc_restorecancel(canc);
 }
 
 /**