in particular for the meta Makefiles of debug_and_release.
the logic is as follows:
- the meta targets ('html_docs' in prepare_docs mode, and 'docs' always)
need to branch out asap, so they are implemented non-recursively in
every makefile.
- all other targets need to be fully recursive. the meta Makefile will
recurse only into one of debug or release, depending on the configure
option (it doesn't matter anyway).
Change-Id: I4e3f714cdda9c3a1021743148b5ee73379e3484d
Reviewed-by: hjk <qthjk@ovi.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
