Added DEBUG definition for release build
Added DEBUG definition for release build

Summary:
It removes 'undefined macro' warning caused by https://github.com/robbiehanson/KissXML/blob/master/KissXML/DDXML.h#L190
Closes https://github.com/facebook/WebDriverAgent/pull/165

Reviewed By: lawrencelomax

Differential Revision: D3378194

Pulled By: marekcirkos

fbshipit-source-id: 66436324266e743f540c82403046bd80a985a7c3

rafael-chavez/WebDriverAgent,zenzhu/WebDriverAgent,qa-dev/WebDriverAgent,b1ueshad0w/WebDriverAgent,zenzhu/WebDriverAgent,calabash/WebDriverAgent,riccoyu/WebDriverAgent,Gogle/WebDriverAgent,riccoyu/WebDriverAgent,rafael-chavez/WebDriverAgent,drptbl/WebDriverAgent,drptbl/WebDriverAgent,PiranhaTeam/WebDriverAgent,Gogle/WebDriverAgent,b1ueshad0w/WebDriverAgent,qa-dev/WebDriverAgent,ymin/WebDriverAgent,Gogle/WebDriverAgent,calabash/WebDriverAgent,Gogle/WebDriverAgent,riccoyu/WebDriverAgent,calabash/WebDriverAgent,drptbl/WebDriverAgent,qa-dev/WebDriverAgent,ymin/WebDriverAgent,riccoyu/WebDriverAgent,PiranhaTeam/WebDriverAgent,qa-dev/WebDriverAgent,ymin/WebDriverAgent,b1ueshad0w/WebDriverAgent,b1ueshad0w/WebDriverAgent,ymin/WebDriverAgent,rafael-chavez/WebDriverAgent,PiranhaTeam/WebDriverAgent,zenzhu/WebDriverAgent,PiranhaTeam/WebDriverAgent,PiranhaTeam/WebDriverAgent