Fix complex static initializers (handle additional '}' and '{' brackets)

- added an example to test suite
- the "warning: assignment discards qualifiers from pointer target type"
  is present but harmless

tests/tcctest.c

@@ -827,6 +827,27 @@ struct aligntest4 {
     double a[0];
 };
 
+struct complexinit0 {
+    int a;
+    int b;
+};
+
+struct complexinit {
+    int a;
+    struct complexinit0 *b;
+};
+
+const static struct complexinit cix[] = {
+    [0] = {
+	.a = 0xfefa,
+	.b = (const struct complexinit0[]) {
+		{ 0x80, 0x81 },
+		{ 0x82, 0x83 },
+		{}
+	}
+    }
+};
+
 void struct_test()
 {
     struct1 *s;
@@ -856,6 +877,11 @@ void struct_test()
     printf("st2: %d %d %d\n",
            s->f1, s->f2, s->f3);
     printf("str_addr=%x\n", (int)st1.str - (int)&st1.f1);
+    printf("cix: %d %d %d %d %d %d %d\n",
+	cix[0].a,
+	cix[0].b[0].a, cix[0].b[0].b,
+	cix[0].b[1].a, cix[0].b[1].b,
+	cix[0].b[2].a, cix[0].b[2].b);
 
     /* align / size tests */
     printf("aligntest1 sizeof=%d alignof=%d\n",