Undo collateral damage from recent patch: Makefile had

lost most of target list and thus 'make clean' didn't clean up very well.

contrib/spi/Makefile

@@ -9,7 +9,11 @@ ifdef REFINT_VERBOSE
 CFLAGS+= -DREFINT_VERBOSE
 endif
 
-TARGETS= refint$(DLSUFFIX) refint.sql
+TARGETS= refint$(DLSUFFIX) refint.sql \
+         timetravel$(DLSUFFIX) timetravel.sql \
+         autoinc$(DLSUFFIX) autoinc.sql \
+         moddatetime$(DLSUFFIX) moddatetime.sql \
+         insert_username$(DLSUFFIX) insert_username.sql
 
 CLEANFILES+= $(TARGETS)
 
@@ -22,4 +26,4 @@ all:: $(TARGETS)
 	    -e "s:_DLSUFFIX_:$(DLSUFFIX):g" < $< > $@
 
 clean:
-	rm -f $(TARGETS)
+	rm -f $(TARGETS) *.o