build problems for python 3.8

[Reimar Bauer]

We have to solve some problems for building a python-3.8 package

Package lxml conflicts for:lxmlowslib -> lxmlskyfield[version='>=1.12,<1.24'] -> lxml

Package pyparsing conflicts for:pint -> packaging -> pyparsing[version='>=2.0.2']matplotlib==3.0.2 -> pyparsingbasemap[version='>=1.2.0'] -> matplotlib-base[version='>=1.0.0,!=3.0.1'] -> pyparsing

Package krb5 conflicts for:netcdf4 -> openssh -> krb5[version='>=1.16.3,<1.17.0a0|>=1.17.1,<1.18.0a0']psycopg2 -> libpq[version='>=12.2,<13.0a0'] -> krb5[version='>=1.14.2,<1.15.0a0|>=1.16,<1.17.0a0|>=1.16.1,<1.17.0a0|>=1.16.3,<1.17.0a0|>=1.16.4,<1.17.0a0|>=1.17.1,<1.18.0a0|>=1.16.2,<1.17.0a0']git -> curl[version='>=7.69.1,<8.0a0'] -> krb5[version='1.14.*|>=1.14.6,<1.15.0a0|>=1.16.1,<1.17.0a0|>=1.16.3,<1.17.0a0|>=1.16.4,<1.17.0a0|>=1.17.1,<1.18.0a0|>=1.18.2,<1.19.0a0|>=1.16.2,<1.17.0a0']

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