[build2] Boost package

[Boris Kolpackov]

Klaim - Joël Lamotte <mjklaim at gmail.com> writes:

> I put my notes so far there:
>
> https://github.com/Klaim/how-vcpkg-invokes-cmake/blob/master/how-vcpkg-launches-cmake.md

That's a nice start. What could be helpful is to instrument vcpkg to
dump the actual command line it is about to execute and then build
a couple of packages to see what it things look like. In fact, I
wonder if vcpkg has some kind of a verbose mode where one can see
all the underlying command it is executing.