Various docs build tweaks:

- Remove roadmap.txt, as we haven't used it for a while and Bugzilla does it
  better.

- Inline docs/{internals,images,xml,lib}/Makefile.am into docs/Makefile.am,
  because they're very simple.  Fewer Makefile.am files is good.

- Remove the dead docs/images/massif*.png files and all references to them.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10720 a5019735-40e9-0310-863c-91ae7b9d1cf9
7 files changed