winemp3: Try to find a valid header instead of failing immediately

[Maarten Lankhorst]

If there's a small amount of corruption in the file, the current
method to deal with it is by killing any hope of continued playback.
This fixes it.
---
This isn't entirely optimized, there is a chance of a false positive
for a header, ideally at least 3 headers are decoded continuously, but
that isn't always possible.
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