Older V does not compile

[ndac-todoroki]

asdf install v 0.1.7 works while 0.1.6 0.1.5 does not. (0.1.7 is the latest now)
This may be happening because asdf-v uses the newest v.c in git, but V is currently drastically changing and could be introducing breaking changes to the compiler.

Although, vlang/vc doesn't keep v.cs in releases, so it is a bit hard to get the latest v.c of the given version. (It could be done from the commits https://github.com/vlang/vc/commits/master, but you need to parse all the commit messages.)
There are limits to the github api too.

[ndac-todoroki]

It may be better to first clone the whole repo, and find for the commit locally?

[ndac-todoroki]

Maybe the whole install process could use git clone, although that requires git. (clone itself could be performed without git, but parsing commits should be done via git rather than including some executable created by me.)

After the 0.2.0 release (or 1.0.0?) when V became stable and the compiler is released within the same tag of the V itself, hopefully we could introduce the tar.gz installation again.

[ndac-todoroki]

Now asdf-v fetches v.c from the vc repo.
Only versions which have the same tag for v and v.c could compile for now.

[ndac-todoroki]

Also, dropped support for versions which require ~/code or VROOT.