build: HTTP-only builds fail several `--libcurl` tests since CVE-2020-8284

[bagder]

I did this

See an example CI build doing a HTTP-only configure and running the test suite.

I expected the following

Run fine

curl/libcurl version

git master

operating system

Any

Way of solution

Previously we've just removed lines that are conditionally output for --libcurl in as "lowest common denominator" style.

But I will go another route this time: In the bagder/hyper branch I have already introduced #ifdef-style logic and handling in test cases, so I'm going to move to merge that work independently and then have the FTP-specific lines in the --libcurl output simply depend on FTP being present in the build.