Bootstrapping & lts

[John Colvin via digitalmars-d-ldc]

Having an "lts" branch to bootstrap from is great, but it 
shouldn't be only a moving target. It would be really great if 
there was either
a) a release/tag of lts corresponding to each release or
b) lts was in some way packaged with the code (a git submodule, 
or maybe just a folder that's only in releases)

Ideally what I want is to be able to download the source for a 
release, pass "-DAUTO_BOOTSTRAP" to cmake and get a fully 
bootstrapped, repeatable build with no binary downloads and no 
unstable (i.e. git HEAD) dependencies.