Add build and installtime requirements on tomli when building for Python < 3.11

Signed-off-by: Michel Alexandre Salim <salimma@fedoraproject.org>

python-flit-core.spec

@@ -9,7 +9,7 @@
 
 Name:           python-flit-core
 Version:        3.9.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        PEP 517 build backend for packages using Flit
 
 # flit-core is BSD-3-Clause
@@ -53,10 +53,17 @@ Requires:       python(abi) = %{python3_version}
 %prep
 %autosetup -p1 -n flit_core-%{version}
 
+%if %{without bootstrap} || 0%{?python3_version_nodots} >= 311
+# Add tomli to build-system.requires and project.dependencies to account for
+# our tomli unbundling.
+# tomllib is a part of standard library since Python 3.11, so we only need this
+# for python_version<'3.11'.
+sed -i 's/^\(dependencies\|requires\) = \[\]/\1 = ["tomli; python_version<'\'3.11\''"]/' pyproject.toml
+
 # Remove vendored tomli that flit_core includes to solve the circular dependency on older Pythons
 # (flit_core requires tomli, but flit_core is needed to build tomli).
-# We don't use this, as tomllib is a part of standard library since Python 3.11.
 rm -rf flit_core/vendor
+%endif
 
 
 %if %{without bootstrap}
@@ -101,6 +108,9 @@ rm -r %{buildroot}%{python3_sitelib}/flit_core/tests/
 
 
 %changelog
+* Thu Jun 29 2023 Michel Alexandre Salim <salimma@fedoraproject.org> - 3.9.0-4
+- Add build and installtime requirements on tomli when building for Python < 3.11
+
 * Fri Jun 16 2023 Python Maint <python-maint@redhat.com> - 3.9.0-3
 - Rebuilt for Python 3.12