eliminating everying TARGET-related was a nice try, but in the real
world (e.g., qttranslations), extra compilers are activated by
PRE_TARGETDEPS, which of course doesn't work when TARGET is entirely
gone.
so instead, let it act as a phony target. this is consistent with the
unix generator.
supersedes 0810d48bc in amending af2847260.
Task-number: QTBUG-57423
Change-Id: I3d2ecc4ff42b37ffe5f71f5c20d17c06b31f4da2
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
019c932ca9