Merge pull request #3492 from DreepyYunky/Add-SetMenu

Add `SetMenu()`

core/sys/windows/user32.odin

@@ -126,6 +126,7 @@ foreign user32 {
 	CreatePopupMenu :: proc() -> HMENU ---
 	DestroyMenu :: proc(hMenu: HMENU) -> BOOL ---
 	AppendMenuW :: proc(hMenu: HMENU, uFlags: UINT, uIDNewItem: UINT_PTR, lpNewItem: LPCWSTR) -> BOOL ---
+	SetMenu :: proc(hWnd: HWND, hMenu: HMENU) -> BOOL ---
 	TrackPopupMenu :: proc(hMenu: HMENU, uFlags: UINT, x: int, y: int, nReserved: int, hWnd: HWND, prcRect: ^RECT) -> i32 ---
 	RegisterWindowMessageW :: proc(lpString: LPCWSTR) -> UINT ---