[build2] Trigger compile of sources when their header dependencies change

[Boris Kolpackov]

Hi Max,

Moldmann Max (DC-MA/ENG52-NA) <Max.Moldmann at boschrexroth-us.com> writes:

> I removed the -M* option, then I had to use absolute path names instead
> of relative include folder names (for the "-I<dir>" parameters).

Yes, that's an important point that I forgot to mention: in build2 all
-I paths must be absolute. We have a TODO item to diagnose this.

Boris