Add corruption check for ELF files into fileinfo

In #281, a corruption check of PE files was added into `fileinfo`. What this check does is that it verifies whether the input PE file is loadable by the Windows loader, and presents this piece of information to the user:
```
"loaderError" :
{
"code" : 9,
"code_text" : "LDR_ERROR_NO_OPTHDR_MAGIC",
"description" : "Invalid IMAGE_OPTIONAL_HEADER::Magic"
},
```
Would it be possible to add a similar check for ELF files?

Read the existing PE corruption check described in #281 and trace the fileinfo entry point that presents its loader errors. Determine the corresponding ELF validation path and expected output from that precedent; done means fileinfo performs and presents a comparable ELF corruption check.

Written by the indexing model from the issue text.