Revert "* configure.in (Makefile): get rid of confliction with -j."

This reverts commit r35104 because it breaks build on FreeBSD.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35113 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

configure.in

@@ -3075,10 +3075,12 @@ AC_CONFIG_FILES(Makefile, [{
 	else
 	    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);'
-    } > confmk$$.tmp && mv -f confmk$$.tmp Makefile],
+	echo 'ruby: $(PROGRAM);' >> Makefile
+    }],
 [EXEEXT='$EXEEXT' gnumake='$gnumake'])
 
 AC_ARG_WITH([ruby-pc],