Stop invoking setup.py during the build

This is a preparation for pip 24.1 which drops setup.py entirely.

[skip changelog]

python-pip.spec

@@ -153,6 +153,7 @@ BuildRequires:  python%{python3_pkgversion}-devel
 # Note that the package prefix is always python3-, even if we build for 3.X
 # The minimal version is for bundled provides verification script
 BuildRequires:  python3-rpm-generators >= 11-8
+BuildRequires:  pyproject-rpm-macros
 BuildRequires:  python%{python3_pkgversion}-setuptools
 BuildRequires:  python%{python3_pkgversion}-wheel
 BuildRequires:  bash-completion
@@ -242,10 +243,10 @@ sed -Ei '/pytest-(cov|xdist|rerunfailures)/d' tests/requirements.txt
 
 
 %build
-%py3_build_wheel
+export PYTHONPATH=./src/
+%pyproject_wheel
 
 %if %{with doc}
-export PYTHONPATH=./src/
 # from tox.ini
 sphinx-build-3 -b html docs/html docs/build/html
 sphinx-build-3 -b man  docs/man  docs/build/man  -c docs/html
@@ -258,7 +259,7 @@ rm -rf docs/build/html/{.doctrees,.buildinfo}
 # /usr/bin/pip yet, so we install using the wheel directly.
 # (This is not standard wheel usage, but the pip wheel supports it -- see
 #  pip/__main__.py)
-%{python3} dist/%{python_wheel_name}/pip install \
+%{python3} %{_pyproject_wheeldir}/%{python_wheel_name}/pip install \
     --root %{buildroot} \
     --no-deps \
     --disable-pip-version-check \
@@ -268,7 +269,7 @@ rm -rf docs/build/html/{.doctrees,.buildinfo}
     --no-warn-script-location \
     --no-index \
     --no-cache-dir \
-    --find-links dist \
+    --find-links %{_pyproject_wheeldir} \
     'pip==%{upstream_version}'
 
 %if %{with doc}
@@ -305,7 +306,7 @@ echo rpm > %{buildroot}%{python3_sitelib}/pip-%{upstream_version}.dist-info/INST
 rm %{buildroot}%{python3_sitelib}/pip-%{upstream_version}.dist-info/RECORD
 
 mkdir -p %{buildroot}%{python_wheel_dir}
-install -p dist/%{python_wheel_name} -t %{buildroot}%{python_wheel_dir}
+install -p %{_pyproject_wheeldir}/%{python_wheel_name} -t %{buildroot}%{python_wheel_dir}
 
 
 %check