Support web proxy in external interop tests

[mouse07410]

Update oqsprovider-externalinterop.sh to support web proxy in external interop tests. To determine whether to resort to proxy handling, checks if env var HTTP_PROXY is set

Fixes #282

[baentsch]

Thanks!

[mouse07410]

@baentsch when do you think this one would be merged? I'm eager to delete my fork of this repo.

[baentsch]

@baentsch when do you think this one would be merged? I'm eager to delete my fork of this repo.

Are you charged for having this fork? I've been trying to understand why CI's failing on this/what's going wrong with the Windows build. Or in other words, I'm not eager merging something with CI failing. But then again, your code has nothing to do with this, so I bite this bullet.

[mouse07410]

Are you charged for having this fork?

He... Not really - but I already have more repos up here than is comfortable, so I'm trying to keep their number down.

I've been trying to understand why CI's failing on this/what's going wrong with the Windows build.

That would be interesting to know - but as you pointed out:

your code has nothing to do with this

Exactly. I'm willing to bet that other CI on this repo also fail on Windows.

Of course, I've no idea whether OpenSSL app (executable) on Windows accepts the same parameters (-proxy, -allow_proxy_certs), or even what version it is at.

so I bite this bullet

Thanks!