Log Message:
waf: updated to 2.0.18

NEW IN WAF 2.0.18
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* Fix a deadlock with cython and subst tasks
* Fix rpath processing so that it no longer breaks dependency chains
* Fix fast_partial.py failures on configuration tests
* Fix duplicate -fno-strict-aliasing flags in Python compilation flags detection
* Fix annoying PIE errors in demos/asm/
* Improve configuration tests cache accuracy
* Improve extras/fast_partial.py compatibility
* Improve extras/doxygen.py outdir parameter settings
* Add a dependency scanner for assembly files (Gas/Yasm)
* Add executable arguments for configuration tests / execute=True
* Add a QtTest example to demos/qt5/
* Add a cross-compilation option to extras/objcopy.py