* configure.in (Makefile): fix duplicated target again.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

configure.in

@@ -2852,9 +2852,11 @@ AC_CONFIG_FILES(Makefile, [{
 	    echo 'distclean-local::; @$(RM) GNUmakefile uncommon.mk'
 	fi
     } > confmk$$.tmp && mv -f confmk$$.tmp Makefile &&
+    {
 	grep '^ruby:' Makefile > /dev/null ||
 	${MAKE-make} info-program | grep '^PROGRAM=ruby$' > /dev/null ||
-	echo 'ruby: $(PROGRAM);' >> Makefile],
+	echo 'ruby: $(PROGRAM);' >> Makefile
+    }],
 [EXEEXT='$EXEEXT' gnumake='$gnumake'])
 
 ruby_pc="${RUBY_BASE_NAME}-${MAJOR}.${MINOR}.pc"