Move a verbose line of %pyproject_buildrequires from stdout to stderr

The `rm -v` command prints the output to stderr, polluting the generated buildrequires

  $ rm -rfv pytest_harvest.dist-info/
  removed 'pytest_harvest.dist-info/METADATA'
  removed 'pytest_harvest.dist-info/LICENSE'
  removed 'pytest_harvest.dist-info/top_level.txt'
  removed 'pytest_harvest.dist-info/entry_points.txt'
  removed directory 'pytest_harvest.dist-info/'

This can lead to RPM errors:

  error: Dependency tokens must begin with alpha-numeric, '_' or '/': 'pytest_harvest.dist-info/METADATA'

Or bogus dependencies -- the SRPM requires "removed" and "directory".

See https://github.com/rpm-software-management/rpm/pull/889

macros.pyproject

@@ -26,7 +26,7 @@ echo 'python3-devel'
 echo 'python3dist(packaging)'
 echo 'python3dist(pytoml)'
 # setuptools assumes no pre-existing dist-info
-rm -rfv *.dist-info/
+rm -rfv *.dist-info/ >&2
 if [ -f %{__python3} ]; then
   RPM_TOXENV="%{toxenv}" %{__python3} -I %{_rpmconfigdir}/redhat/pyproject_buildrequires.py %{?**}
 fi

pyproject-rpm-macros.spec

@@ -6,7 +6,7 @@ License:        MIT
 
 # Keep the version at zero and increment only release
 Version:        0
-Release:        6%{?dist}
+Release:        7%{?dist}
 
 Source0:        macros.pyproject
 Source1:        pyproject_buildrequires.py
@@ -87,6 +87,9 @@ install -m 644 pyproject_buildrequires.py %{buildroot}%{_rpmconfigdir}/redhat/
 %license LICENSE
 
 %changelog
+* Tue Oct 08 2019 Miro Hrončok <mhroncok@redhat.com> - 0-7
+- Move a verbose line of %%pyproject_buildrequires from stdout to stderr
+
 * Fri Jul 26 2019 Petr Viktorin <pviktori@redhat.com> - 0-6
 - Use importlib_metadata rather than pip freeze