Fix build in ELN

[skip changelog]

python-tox.spec

@@ -107,6 +107,14 @@ sed -ri -e 's/"(packaging|filelock|platformdirs|psutil|pyproject-api|pytest|pyte
         -e 's/"(hatchling)>=.*/"\1>=1.13",/g' \
     pyproject.toml
 
+%if 0%{?rhel}
+# There is no build[virtualenv] packaged in ELN
+# https://github.com/fedora-eln/eln/issues/309
+# We flatten the test depndency to build and virtualenv (already listed in runtime deps)
+sed -i 's/"build\[virtualenv\]"/"build"/' pyproject.toml
+%endif
+
+
 %generate_buildrequires
 export SETUPTOOLS_SCM_PRETEND_VERSION="%{version}"
 %pyproject_buildrequires -r %{?with_tests:-g test}