make: drop deprecated rule to process temporary copy of pure modules

Pure modules never be copied to mercurial/ since 511a4384b033.

.hgignore

@@ -54,14 +54,6 b' i18n/hg.pot'
 locale/*/LC_MESSAGES/hg.mo
 hgext/__index__.py
 
-# files installed with a local --pure build
-mercurial/base85.py
-mercurial/bdiff.py
-mercurial/diffhelpers.py
-mercurial/mpatch.py
-mercurial/osutil.py
-mercurial/parsers.py
-
 # Generated wheels
 wheelhouse/
 

Makefile

@@ -64,7 +64,6 b' cleanbutpackages:'
 	-$(PYTHON) setup.py clean --all # ignore errors from this command
 	find contrib doc hgext hgext3rd i18n mercurial tests \
 		\( -name '*.py[cdo]' -o -name '*.so' \) -exec rm -f '{}' ';'
-	rm -f $(addprefix mercurial/,$(notdir $(wildcard mercurial/pure/[a-z]*.py)))
 	rm -f MANIFEST MANIFEST.in hgext/__index__.py tests/*.err
 	rm -f mercurial/__modulepolicy__.py
 	if test -d .hg; then rm -f mercurial/__version__.py; fi