build: doc: `make` generates requested documentation

Generate man pages, HTML, neither or both according to ./configure.
Based on the work done for libnetfilter_queue.

[ This patch updates the default ./configure option to build the
  manpages in case that doxygen is available. ]

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

1 files changed, 4 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index ef6bb0f..2dc0dfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,8 @@ Makefile.in
 /configure
 /libtool
 
-/doxygen/
-/doxygen.cfg
+/doxygen/doxygen.cfg
+/doxygen/doxyfile.stamp
+/doxygen/man/
+/doxygen/html/
 /*.pc