build/pkgs/pkgconfig: Do not remove pyproject.toml, add poetry_core as a dependency

Author: Matthias Koeppe

build/pkgs/pkgconfig/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) | $(PYTHON_TOOLCHAIN) pkgconf
+$(PYTHON) | $(PYTHON_TOOLCHAIN) pkgconf poetry_core
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/pkgconfig/spkg-install.in

@@ -1,10 +1,5 @@
 cd src
 
-# Make sure that modern pip uses the generated setup.py
-# that is distributed with the PyPI tarball,
-# so we do not have to have poetry.  Trac #29803.
-rm -f pyproject.toml
-
 sdh_pip_install .
 
 if [ $? -ne 0 ]; then