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IBinTools: Block loading incompatible interface versions (#979)
In #705 SourceMod received support for x64 binaries. The `IBinTools` interface was updated to call functions in 64bit binaries. The `PassInfo` struct's size was increased and the `Create(V)Call()` functions signatures changed, thus making the interface incompatible for consumers which were compiled against an earlier version. `SMInterface::IsVersionCompatible` wasn't adjusted to that fact, so extensions compiled against pre SM 1.10 could request an `IBinTools` interface pointer, but crash when they try to use it. This change makes requests to older interface versions invalid, thus letting `RequestInterface` return `NULL` for older extensions. It doesn't fix the backwards incompatibility, but at least makes the problem more blatant, so extensions can handle it themselves.
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