Based on advice from IRC, cross compile is also active
for simulator.
The assumption build arch == host arch calls for not
cross compiling, did not work due to the fact that iOS
compiles without DESKTOP.

Cross compiling to the same platform gives problems with e.g. libxml2
will be solved in a later commit

Change-Id: If18ee5f9473dd983e2cb705390017229c4205a71