fix doc target recursions

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>

0 files changed, 0 insertions, 0 deletions