Add corruption check for ELF files into fileinfo

[s3rvac]

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?