Legacy resampler code in the satpy package is causing an FTBFS due to a failed `_fornav` import.
```
dh_auto_test -O--buildsystem=pybuild
I: pybuild base:310: cd /<<PKGBUILDDIR>>/.pybuild/cpython3_3.12_satpy/build; python3.12 -m pytest -k " not test_retrieve and not test_offline_retrieve and not test_retrieve_all and not test_download_script and not test_start_time and not test_end_time and not test_mimic_TPW2_nc and not TestAngleGeneration and not test_get_luts and not test_convert_remote_files_to_fsspec_fsfile and not test_convert_remote_files_to_fsspec_filename_dict and not test_convert_remote_files_to_fsspec_mixed_sources and not test_get_satpos_from_satname and not test_distributed and not test_rayleigh_corrector and not test_rayleigh_with_angles and not test_float_write_with_unit_conversion and not test_aggregate and not test_median and not test_no_downloads_in_tests and not test_colorize_with_interpolation and not test_colorize" --ignore=satpy/tests/reader_tests/test_insat3d_img_l1b_h5.py --ignore=satpy/tests/reader_tests/gms/test_gms5_vissr_l1b.py --ignore=satpy/tests/reader_tests/gms/test_gms5_vissr_navigation.py satpy/tests
ImportError while loading conftest '/<<PKGBUILDDIR>>/.pybuild/cpython3_3.12_satpy/build/satpy/conftest.py'.
satpy/__init__.py:29: in <module>
from satpy.dataset import DataID, DataQuery # noqa
satpy/dataset/__init__.py:23: in <module>
from .metadata import combine_metadata # noqa
satpy/dataset/metadata.py:27: in <module>
from satpy.writers.utils import flatten_dict
satpy/writers/__init__.py:37: in <module>
from satpy.resample import get_area_def
satpy/resample.py:156: in <module>
from pyresample.ewa import fornav, ll2cr
/usr/lib/python3/dist-packages/pyresample/ewa/__init__.py:69: in <module>
from .ewa import fornav, ll2cr # noqa
/usr/lib/python3/dist-packages/pyresample/ewa/ewa.py:24: in <module>
from pyresample.ewa import _fornav, _ll2cr
E ImportError: cannot import name '_fornav' from partially initialized module 'pyresample.ewa' (most likely due to a circular import) (/usr/lib/python3/dist-packages/pyresample/ewa/__init__.py)
E: pybuild pybuild:395: test: plugin pyproject failed with: exit code=4: cd /<<PKGBUILDDIR>>/.pybuild/cpython3_3.12_satpy/build; python3.12 -m pytest -k " not test_retrieve and not test_offline_retrieve and not test_retrieve_all and not test_download_script and not test_start_time and not test_end_time and not test_mimic_TPW2_nc and not TestAngleGeneration and not test_get_luts and not test_convert_remote_files_to_fsspec_fsfile and not test_convert_remote_files_to_fsspec_filename_dict and not test_convert_remote_files_to_fsspec_mixed_sources and not test_get_satpos_from_satname and not test_distributed and not test_rayleigh_corrector and not test_rayleigh_with_angles and not test_float_write_with_unit_conversion and not test_aggregate and not test_median and not test_no_downloads_in_tests and not test_colorize_with_interpolation and not test_colorize" --ignore=satpy/tests/reader_tests/test_insat3d_img_l1b_h5.py --ignore=satpy/tests/reader_tests/gms/test_gms5_vissr_l1b.py --ignore=satpy/tests/reader_tests/gms/test_gms5_vissr_navigation.py satpy/tests
```
Upstream commit https://github.com/pytroll/satpy/commit/dc3ee7d30151584caaae05e6fb21401702614cfd corrects the issue. A patch is attached to fix the issue.
FTBFS fix