Remove restricted keyword tests

src/test/compile-fail/restricted-keyword1.rs

@@ -1,7 +0,0 @@
-// error-pattern:found `fail` in restricted position
-
-fn main() {
-    match true {
-      {fail} { }
-    }
-}

src/test/compile-fail/restricted-keyword2.rs

@@ -1,5 +0,0 @@
-// error-pattern:found `fail` in restricted position
-
-fn main() {
-    enum fail = int;
-}