avifil32: Skip tests when we couldn't create or open the AVI file

[GOUJON Alexandre]

On 02/11/2011 12:10 AM, Julius Schwartzenberg wrote:
> Is there a specific situation in which the file creation fails? I 
> expected the temporary directory would always be writable when I 
> created it like that. Maybe that is not a good assumption when writing 
> tests though?
I wrote the patch because of the crash seen here :
http://test.winehq.org/data/020245bba10e15e2a1b415f4a4a08d43f9fb1025/xp_naoliv/avifil32:api.html

However, I contacted the user who submitted it and it was in fact a 
"stripped" version of Windows.
Nevertheless, I do think the case could happen again (not enough disk 
space for instance).
Moreover, it's basically a "if" "win_skip" and "return" so it won't slow 
down the test.

What do you think ?
Does it worth applying my patch ?
Well, it's up to you; you know my point of view.

Thanks