user32: Add stub for SetWindowCompositionAttribute.

dlls/ext-ms-win-ntuser-private-l1-1-1/ext-ms-win-ntuser-private-l1-1-1.spec

@@ -15,7 +15,7 @@
 @ stub RecordShutdownReason
 @ stdcall RegisterLogonProcess(long long) user32.RegisterLogonProcess
 @ stub SetThreadInputBlocked
-@ stub SetWindowCompositionAttribute
+@ stdcall SetWindowCompositionAttribute(ptr ptr) user32.SetWindowCompositionAttribute
 @ stdcall SetWindowStationUser(long long) user32.SetWindowStationUser
 @ stub SwitchDesktopWithFade
 @ stub UnlockWindowStation

dlls/user32/user32.spec

@@ -711,6 +711,7 @@
 @ stdcall SetUserObjectInformationW(long long ptr long)
 @ stdcall SetUserObjectSecurity(long ptr ptr)
 @ stdcall SetWinEventHook(long long long ptr long long long)
+@ stdcall SetWindowCompositionAttribute(ptr ptr)
 @ stdcall SetWindowContextHelpId(long long)
 @ stdcall SetWindowDisplayAffinity(long long)
 @ stub SetWindowFullScreenState

dlls/user32/win.c

@@ -4183,3 +4183,13 @@ BOOL WINAPI SetWindowDisplayAffinity(HWND hwnd, DWORD affinity)
     SetLastError(ERROR_NOT_ENOUGH_MEMORY);
     return FALSE;
 }
+
+/**********************************************************************
+ *              SetWindowCompositionAttribute (USER32.@)
+ */
+BOOL WINAPI SetWindowCompositionAttribute(HWND hwnd, void *data)
+{
+    FIXME("(%p, %p): stub\n", hwnd, data);
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return FALSE;
+}