Issue #349: none of automake's clean targets are suite for really cleaning up everything, so add a local "really-clean" target that does so.

Makefile.am

@@ -56,13 +56,43 @@ libjson_c_la_SOURCES = \
 	strerror_override.c \
 	strerror_override_private.h
 
+
+DISTCLEANFILES=
+DISTCLEANFILES+= \
+	config.h \
+	json-c-uninstalled.pc \
+	json-c.pc \
+	json_config.h
+
 distclean-local:
 	-rm -rf $(testsubdir)
-	-rm -rf config.h.in~ Makefile.in aclocal.m4 autom4te.cache/ config.guess config.sub depcomp install-sh ltmain.sh missing
-	-rm -f INSTALL test-driver tests/Makefile.in compile
 
-maintainer-clean-local:
-	-rm -rf configure
+JSON_CLEANFILES=
+JSON_CLEANFILES+= \
+	Makefile.in \
+	aclocal.m4 \
+	autom4te.cache/ \
+	compile \
+	config.guess \
+	config.h.in \
+	config.sub \
+	configure \
+	depcomp \
+	install-sh \
+	ltmain.sh \
+	missing \
+	test-driver \
+	tests/Makefile.in
+JSON_CLEANFILES+= \
+	libtool \
+	stamp-h1 \
+	stamp-h2
+
+# There's no built-in way to remove these after all the other
+# maintainer-clean steps happen, so do it explicitly here.
+really-clean:
+	$(MAKE) maintainer-clean
+	rm -rf ${JSON_CLEANFILES}
 
 uninstall-local:
 	rm -rf "$(DESTDIR)@includedir@/json-c"