LGTM Security analysis

[Moelf]

Per Slack discussion, people may have interests taking a look && fix these:
https://lgtm.com/projects/g/JuliaLang/julia/?mode=list

[rfourquet]

Please provide more information on what this linked website does.

[Moelf]

I think it's pretty self-explained basically it does security analysis etc. For Julia, it doesn't support Julia code but looks like it picked some "bad/ugly" (working) code in the C code base of Julialang.

[ViralBShah]

I'm converting this to a discussion. Someone needs to go through these and see if any of them are meaningful and open specific issues/PRs.