Fix compiler issues in test on C99

Fixes the following issue when compiling using C99:

ext/-test-/rb_call_super_kw/rb_call_super_kw.c
ext/-test-/random/loop.c:16:39: error: extra ';' outside of a function [-Werror,-Wextra-semi]
RB_RANDOM_DEFINE_INIT_INT32_FUNC(loop);

ext/-test-/random/loop.c

@@ -13,7 +13,7 @@ static const rb_random_interface_t random_loop_if = {
     RB_RANDOM_INTERFACE_DEFINE_WITH_REAL(loop)
 };
 
-RB_RANDOM_DEFINE_INIT_INT32_FUNC(loop);
+RB_RANDOM_DEFINE_INIT_INT32_FUNC(loop)
 static size_t
 random_loop_memsize(const void *ptr)
 {