UNIMPLEMENTED: gdi32: SetLayeredWindowAttributes

Tested in r.49071 with Vbox 3.2.8. To replicate, install the app then run it. Windbg (v.6.10.0003.233) errors out very early with E_OUTOFMEMORY Win32 error.

Application debugging pointed to SetLayeredWindowAttributes function, after which, there is a check for FALSE. When triggered, GetLastError is being called and eventually, error message is drawn.

Connection yet unknown. Hacking the check allowed the main window app to appear.

This bug can be confirmed in two ways:

• hacking SetLayeredWindowAttributes to return TRUE;
• having SetLayeredWindowAttributes set its own LastError, seeing if its gonna change the one displayed;