Very damaged/truncated PE is reported as unsupported format

[metthal]

We were previously reporting for a very damaged PE files that they are PEs with a loader errors. For example such file is 7c9435ecd691de2a53e0d4ca32f3ae57725a248fe3d86230efadefd131029eb2. As of right now, we are reporting it as an unsupported file format.

Don't have it confirmed but it seems like #812 might be a breaking point where regression was introduced. We'd like to reporting this as a very broken PE instead of unsupported file format.

[ladislav-zezula]

I slightly changed the logic:

• Before: The image loader in fileinfo set ldrError to LDR_ERROR_NTHEADER_OUT_OF_FILE and returned ERROR_INVALID_FILE
• After: The image loader sets ldrError to LDR_ERROR_NTHEADER_OUT_OF_FILE and returns ERROR_NONE.

As result, the first phase check now recognizes the file as PE and the final status is LDR_ERROR_NTHEADER_OUT_OF_FILE.

#922
avast/retdec-regression-tests#83

[s3rvac]

Fixed in #922.