fix runtime panic with err_invalid_ifeq4.mk

still error message differs
--- out/err_invalid_ifeq4.mk/out.make   2015-06-30 17:34:44.657822315 +0900
+++ out/err_invalid_ifeq4.mk/out.kati   2015-06-30 17:34:44.657822315 +0900
@@ -1,5 +1,5 @@
 ===  ===
-Makefile:3: *** invalid syntax in conditional.
+Makefile:4: *** extraneous "endif".

 === FILES ===
1 file changed