This reduces dramatically the command-line for compiling Qt sources.
These are private macros, only to be used by Qt's own modules, so the
compiler setting is either the same or, possibly, better. In other
words, in the worst case, when compiling a module with a better
compiler than for qtbase, such module might not enable all the
functionality it could otherwise do.
If we switch to a buildsystem that can support this properly in the
future, these macros should be removed.
Change-Id: I71f2d12ec98c9dd40eaab9de4a17446bd1066020
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
