[Bug 36375] eRacer demo doesn't start, fails to load audio files

https://bugs.winehq.org/show_bug.cgi?id=36375

--- Comment #2 from Sagawa  ---
Created attachment 49465
  --> https://bugs.winehq.org/attachment.cgi?id=49465
proposed patch

Hi,  Béla
Could you try out this patch?

Actually, this issue isn't my fault (and regression). Even before the commit,
eRacer shows the error message when specifying WINEDEBUG=mmio.

I find out the root cause that wine sends MMIOM_SEEK message while opening a
file. However, in native, MMIOM_SEEK isn't sent at all. Thus, I removed
MMIOM_SEEK usages in mmioOpen() when custom procedure is used. Now, it works on
my PC.

If it works in your environment, too, I'll send the patch to wine-patches.
Thanks in advance.