[PATCH 1/2] Fixed cmake build.

[Patrick Valsecchi]

Non parallel build was broken because qthelper.cpp was depending
indirectly on a QT generated file and no cmake dependency was enforcing
the file to be generated before. I've removed the not needed #include
that was introducing this dependency.

In cmake, {FOO STREQUAL ""} is TRUE only if FOO is defined and
empty. Fixed a couple of bad usages.

Made the required libraries actually required in cmake.

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