Revert "bpo-30487: automatically create a venv and install Sphinx when running make (GH-4346)" (#4592)

Fix breakage documented in bpo-32149.
This reverts commit d8d6b9122134f040cd5a4f15f40f6c9e3386db4d.
diff --git a/Doc/Makefile b/Doc/Makefile
index 69e7e2e..307d1e0 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -17,7 +17,7 @@
 
 .PHONY: help build html htmlhelp latex text changes linkcheck \
 	suspicious coverage doctest pydoc-topics htmlview clean dist check serve \
-	autobuild-dev autobuild-stable
+	autobuild-dev autobuild-stable venv
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"
@@ -39,7 +39,7 @@
 	@echo "  check      to run a check for frequent markup errors"
 	@echo "  serve      to serve the documentation on the localhost (8000)"
 
-build: venv
+build:
 	-mkdir -p build
 # Look first for a Misc/NEWS file (building from a source release tarball
 # or old repo) and use that, otherwise look for a Misc/NEWS.d directory
@@ -122,11 +122,9 @@
 	-rm -rf build/* $(VENVDIR)/*
 
 venv:
-	@if [ "$(SPHINXBUILD)" == "PATH=$(VENVDIR)/bin:$$PATH sphinx-build" ]; then \
-		$(PYTHON) -m venv $(VENVDIR); \
-		echo "A virtual environment for Docs has been made in the $(VENVDIR) directory"; \
-		$(VENVDIR)/bin/python3 -m pip install Sphinx blurb; \
-	fi
+	$(PYTHON) -m venv $(VENVDIR)
+	$(VENVDIR)/bin/python3 -m pip install -U Sphinx blurb
+	@echo "The venv has been created in the $(VENVDIR) directory"
 
 dist:
 	rm -rf dist