Related: rhbz#2121654 Work around pkgconfig(libpq) conflict
    
    ...between libpq-devel and postgresql-private-devel, so that the BuildRequires:
    pkgconfig(libpq) would now erroneously pick up postgresql-private-devel rather
    than libpq-devel at least on F36 (and which causes trouble when trying to do a
    LibreOffice flatpak build, which only bundles libpq but not
    postgresql-private-libs)
    
    (cherry picked from commit 98b9b9b60e381737e4451f772e53e49d4c1998a9)