[Interest] qmake: Test if environment variable is set.

[Carel Combrink]

Thiago,

> So TEST_3 isn't empty. Only the output from message was empty because it
> performed an extra expansion.
>

Thanks for the explanation, it makes a sense now.

Michael,

> I would use TEST_3=$$(FOO) instead of TEST_3=$(FOO)


This does work correctly thanks.

Reading the documentation on the difference between $$() and $() it makes
sense as Thiago explained.

Thank you both for the help.

Regards,
Carel
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