[Qt-creator] qmake debug release conditional builds

[Coda Highland]

> CONFIG(debug, debug|release) {
> CONFIG(release, debug|release) {
> warning("release set with debug! Ignoring release.")
> }

This will never trigger. The two-parameter form of CONFIG() guarantees
that the two options are mutually exclusive, and whichever is declared
last wins. If the first conditional succeeds, the second one CANNOT
return true.

/s/ Adam