[yocto] Add --enable-speech-dispatcher

[Laurent JOLI]

Hello, 

I work on the following context : 

qt: 5.9.2 
SRCREV_qtwebengine = "c11c2c8981e647c1eb2c6753ce77d436b92fff87" 
SRCREV_chromium = "cfe8c60903b327ac94406661350f4ac05aa8c21b" 

So, I use the layer of QT5 : 

https://github.com/meta-qt5/meta-qt5 

with the commit : bbb304456978fa9713932e9ff529d18a5ef2a947 

I can run correctly the browser : quicknanobrowser 

I also can run correctly speech-dispatcher with espak 

When running quicknanobrowser on website using web speech api, it does not work ( no voices listed, no audio output) even if web speech synthesis support seems to be detected. 

Does qtwebengine supports Web Speech API? 
If yes, how qtwebengine must be configured to support Web Speech Api (webrtc...)? 

Regards, 
LJO 
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