docs: Enabling `doxygen` build target

If doxygen is installed, `./waf doxygen` can be used to build API
documentation in ./build/docs.

Change-Id: Ib760668cbedc5a45f29c5a610548b07f7e459a38
refs: #1151
3 files changed
tree: e8173a77f3ffe32e05b96b1fe6d168f04baf6734
  1. .waf-tools/
  2. daemon/
  3. docs/
  4. tests/
  5. .gitignore
  6. .travis.yml
  7. COPYING
  8. INSTALL.md
  9. README-dev.md
  10. README.md
  11. waf
  12. wscript
README.md

NFD - Named Data Networking Forwarding Daemon