Fix Yet Another Horrid Makefile Bug that was causing the run-fail tests to silently pass.

src/Makefile

@@ -641,7 +641,7 @@ test/run-fail/%.out.tmp: test/run-fail/%$(CFG_EXE_SUFFIX) \
       if [ $$X -eq 0 ] ; then exit 1 ; else exit 0 ; fi
 	$(CFG_QUIET)grep --text --quiet \
       "`awk -F: '/error-pattern/ { print $$2 }' \
-        $(subst .out.tmp,.rs,$@) \
+        test/run-fail/$(basename $*).rs \
         | tr -d '\n\r'`" $@
 
 test/compile-fail/%.boot.out.tmp: test/compile-fail/%.rs $(BREQ)