Update to doxygen-1.8.9.
ruby-2.2.0: fix build of capi docs and statistics to make explicit docs part. 
 graphviz-2.38.0: fix build with ruby-2.2.0.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk@15274 af4574ff-66df-0310-9fd7-8a98e5e911e0