- Code factorization

(struct should be fully initialized)

fix #616/fixes #616

    EXT is available, use pavgusb when 3DNow is available, and nothing instead.

Fix quotes arround inputs like "fake: option fake-file=thing.png" which should be "fake:" option "fake-file=thing.png"

* don't try to open real streams, but quit before triggering any errors. thanks to thedj for pointing this out.

    Please revert if this breaks something I didn't know about.
* real.c: minor clean up

- Fix minor memleak

* some minor string corrections and output changes

(exemple segfault with : $ ./vlc --fake-file="C:\Documents and Settings\Antoine\Mes documents\Mes images\vlc-1337.jpg" fake: )