Log Message:
Updated waf to 1.9.12.

NEW IN WAF 1.9.12
-----------------
* Work around config.log encoding issues on windows/Python3.6/console #1974
* Handle spaces in python path detection on windows #1973
* Set a better default path for windows import libraries #1959
* Fix variable propagation for javac targets #1969
* Various cpplint enhancements #1961 #1963
* Various eclipse project generator enhancements #1967 #1968 #1970
* Various C# enhancements #1975 #1976 #1977
* Override resx namespaces #1978