Stop defining empty DEPENDENCY_TOOL_ARGS
On !APPLE systems we were defining an empty DEPENDENCY_TOOL_ARGS macro, resulting in a clazy warning due to `QStringLiteral(DEPENDENCY_TOOL_ARGS)`. Now we define this macro only when needed, and we check with an #ifdef if we need to use it. As a bonus point, we avoid to pass to QProcess::setArguments() a list whose first element is empty.
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