Remove the hack to create most Makefile variables on Unix

I've just discovered, quite by accident, a new undocumented feature of
qmake: it can write Makefile variables. So let's use this feature
where we can instead of our hack.  The only thing is that it prepends
an "EXPORT_" prefix, so we can't use it for a variable like $(prefix)
that Linux distributions are expected to try to modify during make
install.

I've verified that the feature remains in Qt 5.x.

Signed-off-by: Thiago Macieira <thiago@macieira.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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