Removed the non-existing-in-C "struct/union scope" for structs/unions.

Fixed handling of struct/union field declarations without identifiers, which do nothing.

test/misc/bug1437.c

@@ -1,23 +0,0 @@
-
-/* bug #1437 enum declaration in struct does not compile */
-
-struct nodelist1 {
-    enum { DEAD1, LIVE1, ONCE1, TWICE1 } live1;
-} firstnode1 = {ONCE1};
-
-enum nodestate2 { DEAD2, LIVE2, ONCE2, TWICE2 } live2;
-
-struct nodelist2 {
-    enum nodestate2 live2;
-} firstnode2 = {TWICE2};
-
-int main (void)
-{
-    if (firstnode1.live1 != ONCE1) {
-        return 1;
-    }
-    if (firstnode2.live2 != TWICE2) {
-        return 1;
-    }
-    return 0;
-}