Fix tests on big-endian systems

Also, remove a redundant skip, as the listed test is skipped by upstream
already.

python-xarray.spec

@@ -14,8 +14,10 @@ Source0:        %pypi_source %{srcname}
 # Data for examples only.
 Source1:        https://github.com/pydata/xarray-data/archive/%{data_commit}/xarray-data-%{data_commit}.tar.gz
 # All Fedora specific.
-Patch0001:      0001-DOC-Skip-examples-using-unpackaged-dependencies.patch
-Patch0002:      0002-DOC-Don-t-print-out-conda-pip-environment.patch
+Patch:          0001-DOC-Skip-examples-using-unpackaged-dependencies.patch
+Patch:          0002-DOC-Don-t-print-out-conda-pip-environment.patch
+# https://github.com/pydata/xarray/pull/9380
+Patch:          0003-Fix-tests-on-big-endian-systems.patch
 
 BuildArch:      noarch
 
@@ -113,8 +115,6 @@ rm -rf xarray
 pytest_args=(
   -n auto
   -m "not network"
-  # https://github.com/pydata/xarray/issues/7513
-  -k 'not test_open_mfdataset_manyfiles'
   # this test somehow crashes python interpreter entirely, was xfail upstream till recently
   -k 'not test_save_mfdataset_compute_false_roundtrip'
 )