build: doc: "make" builds & installs a full set of man pages

Repeat what we did for libnetfilter_queue:
 - New makefile in doxygen directory. Rebuilds documentation if any sources
   change that contain doxygen comments:
   - Renames each group man page to the first function listed therein
   - Creates symlinks for subsequently listed functions
   - Deletes _* temp files and moves sctruct-describing man pages to man7
 - Update top-level makefile to visit new subdir doxygen
 - Update top-level configure to only build documentation if doxygen installed
 - Add --with/without-doxygen switch
 - Check whether dot is available when configuring doxygen
 - Reduce size of doxygen.cfg and doxygen build o/p
 - `make distcheck` passes with doxygen enabled
Aditionally, exclude opaque structs mnl_nlmsg_batch & mnl_socket

Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions