bpo-33485: autoconf target behaves correctly in more cases

Author: grimreaper

Makefile.pre.in

@@ -1628,10 +1628,7 @@ recheck:
 # Regenerate configure and pyconfig.h.in
 .PHONY: autoconf
 autoconf:
-	# Regenerate the configure script from configure.ac using autoconf
-	(cd $(srcdir); autoconf -Wall)
-	# Regenerate pyconfig.h.in from configure.ac using autoheader
-	(cd $(srcdir); autoheader -Wall)
+	(cd "$(srcdir)" && autoreconf --force --verbose --install -Wall)
 
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