Do not ignore ${SWIG_DIR} when invoking ${SWIG_EXECUTABLE}

[traversaro]

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Without this fix, the compilation with a custom non-system swig is failing. See https://github.com/Kitware/CMake/blob/v3.29.2/Modules/UseSWIG.cmake#L725 for similar code inside CMake.

This is important for compatibility with Ubuntu 24.04 when using apt dependencies, as the swig that ships with Ubuntu 24.04 is swig 4.2.0, that is not compatible with YARP.

[sonarqubecloud[bot]]

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