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matplotlib: only use pkgconf if it's a dependency

We assume pkg-config is provided by the host on Linux. We should only set the PKG_CONFIG environment variable if the dependency is actually available.


Reported and debugged here: https://discourse.paraview.org/t/paraview-5-9-0-rc1-superbuild-package-configuration-issue-affecting-matplotlibs-detection-of-freetype-and-zlib/5831

Cc: @utkarsh.ayachit

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