Log Message:
waf: updated to 2.0.16

NEW IN WAF 2.0.16
* Fix task semaphore errors on stateful tasks
* Fix encoding errors with UTF-8 paths on Python 2
* Fix encoding errors in waf_unit_test
* Improve dependency between javac task and use-d generated jars nodes
* Install pdb files with /debug:* flags
* Make javadoc detection optional
* Improve md5_tstamp documentation
* Add extras/color_msvc to colorizes MSVC outputs
* Fix symbol regex on mac-o binaries in extras/syms
* Maintain order of lines in doxyfile in extras/doxygen
* Improve extras/msvcdeps path handling
* Add extras/clang_cross for cross-compilation using clang