This fixes having to explicitly state for each project that we want
to state that we should ignore unused command line arguments. This also
fixes a problem where the --no-warn-unused-cli flag was getting added to a
random variable in the generated config file when a project was placed in
developer mode.

Always build in release mode since the symlinks on Linux don't
work right for debug mode (libpng.{so,a} points to libpng14.{so,a}
instead of libpng14d.{so,a}).

* Help ParaView location freetype.
* Build PNG with required "features"