Log Message:
Update devel/waf to waf-1.9.8

Changes:
1.9.8
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* Keep winres flags in subsequent detections #1908
* New -qopenmp option #1900
* Enable Java compat attribute as numbers #1899
* Qt5 library detection enhancements
* Save compiler optimization flags from foo-config #1887
* Emscripten enhancements #1885
* Fix chmod with tuple rules #1884
* Include all vars in tuple rules #1883
* Compile glib2 schemas per directory #1881
* Boost libraries detection enhancements
* Work around an annoying Python 3.6 regression #1889