kernel32: avoid unprotected sprintf on registry/user-supplied format string

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

I stumbled across this sprintf which I replaced by snprintf.

As I've seen public references to the "winedbg --auto %ld %ld"
setting in the registry, I've made sure that %ld %ld is supported, although the less common %lu would be more appropriate -- too late.

Sadly, printf format strings are at odds with type abstractions.

Regards,
	Jörg Höhle
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