Win32: Correctly layout the files for the XPI
Win32: Correctly layout the files for the XPI

Close #11856

(cherry picked from commit 70e212146138688b9cb5c4df1f545ea91c2cac2a)
Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2