wintrust: Fail to load a certificate from a PE file if the certificate entry isn't a known type

[Juan Lang]

Fixes bug 12014.  The executable's PE header has a valid offset and
size in the security data directory, but the data at that offset and
size are part of another section.  There's no actual
signature/certificate in the PE file.  Fortunately failing fixes the
installer.
--Juan
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