sws: Sync with upstream

Changes in this version:
* [Store layout window flags in single variable](633fb2c51a)
* [Use external variable to detect if desktop is foreground](4b9ff84436)
* [Fix regression when detecting foreground window changes](8ab7a45162)
* [Draw DWM-like placeholder when window has zero width or height](764a2913b4)
* [Enforce a minimum size for a window rectangle](bc8b04e451)

libs/sws

@@ -1 +1 @@
-Subproject commit 44761479872f77e2ba1bc9f6e9dfbec90386babc
+Subproject commit bc8b04e451649964ee3d74255f9e9eda13ef24c3