Initial commit of netcdf-c - can be used by ParaView instead of bundled library.
Depends on D10550.
Built paraview against it.
Replaced pkgconfig(hdf5-1.10.4), as autotools-based build doesn't generate it.
Switch to pkgconfig(hdf5_hl).
Switch to GitHub tarball, as official tarballs are removed from the site when there are new releases.
Not updating to 4.8.0 at this time as it's a full ABI break.