qmake: Added "deng_noopenal" option for disabling OpenAL
Having CONFIG-=deng_openal in config_user.pri does not workany more because config_user.pri is read before the platform-specific configs.
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qmake: Added "deng_noopenal" option for disabling OpenAL
Having CONFIG-=deng_openal in config_user.pri does not work
any more because config_user.pri is read before the platform-
specific configs.