It's possible to get the latter from the former, and the former
is useful for other things too (access to the preprocessor, for example).
Change-Id: I708d709129fd3a35bf7c63da4de09c2e696b382d
Check that only LO's files are processed, as there's no point otherwise.
Also warn about files in workdir/solver/builddir, as those are either
generated or copies. Try to automatically match include files from
solver to srcdir though, as that's where include files are usually
included from :(.
Change-Id: Ie8389e903f623a9d0e75015091acc0da78e76c3a
