[Bug 40460] winetricks xna31 and dotnet20sp2 fail

https://bugs.winehq.org/show_bug.cgi?id=40460

--- Comment #6 from Sebastian Lackner  ---
When I just call "winetricks xna31" I'm still not able to see any kind of
failure here on my machine. However, I played around a bit more, and when I add
the "-q" switch it indeed fails. Is that also what you guys use?

On the first sight, it seems to be a race-condition in winetricks. Installation
of dotnet20sp2 is started before dotnet20 is fully finished. Before the commit,
RegNotifyChangeKeyValue always returned immediately with a failure, now the
application will properly wait. Those timing differences are probably what
causes the "regression".

Proposed change for winetricks:

--- snip ---
--- a/src/winetricks
+++ b/src/winetricks
@@ -5800,6 +5800,7 @@ load_dotnet20sp2()
     w_call remove_mono

w_call dotnet20
+    $WINESERVER -w

# FIXME: verify on pristine windows XP:
     if w_workaround_wine_bug 34803
--- snip ---

BTW: At some places winetricks uses $DRIVE_C which looks like an undefined
variable to me.