ruby: Fix build failures with Ruby 3.4

Ruby 3.4 started to actually mark some deprecated functions as
*deprecated* now resulting in compiler warnings (which due to -Werror we
treat as errors and thus the build fails).

The *new* functions were actually introduced back in Ruby 1.9.2, so have
been around for quite some time. We claim support for Ruby 2.0 onwards
so this is more than fine.

The new API replaces the old 'mark' and 'free' parameters with a struct
that allows for more fine tuning/configuration. We never made use of
either of those parameters and so the only members of this struct we
*need* to set is the structure wrapper name and the dsize function
pointer which is passed a pointer to the underlying wrapped structure to
calculate its memory usage. While this is *not* required the
documentation *recommends* setting it (though it doesn't say how it's
used).

Ruby pytests still pass after this change...

Closes: #1525
Link: <https://bugs.ruby-lang.org/issues/19998>
Link: <https://docs.ruby-lang.org/en/3.4/extension_rdoc.html#label-C+struct+to+Ruby+object>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

src/ruby/nxt_ruby_stream_io.c

@@ -19,6 +19,24 @@ static VALUE nxt_ruby_stream_io_write(VALUE obj, VALUE args);
 nxt_inline long nxt_ruby_stream_io_s_write(nxt_ruby_ctx_t *rctx, VALUE val);
 static VALUE nxt_ruby_stream_io_flush(VALUE obj);
 static VALUE nxt_ruby_stream_io_close(VALUE obj);
+nxt_inline size_t nxt_ruby_dt_dsize_rctx(const void *arg);
+
+
+static const rb_data_type_t  nxt_rctx_dt = {
+    .wrap_struct_name  = "rctx",
+    .function  = {
+        .dsize         = nxt_ruby_dt_dsize_rctx,
+    },
+};
+
+
+nxt_inline size_t
+nxt_ruby_dt_dsize_rctx(const void *arg)
+{
+    const nxt_ruby_ctx_t  *rctx = arg;
+
+    return sizeof(*rctx);
+}
 
 
 VALUE
@@ -73,7 +91,7 @@ nxt_ruby_stream_io_new(VALUE class, VALUE arg)
 {
     VALUE  self;
 
-    self = Data_Wrap_Struct(class, 0, 0, (void *) (uintptr_t) arg);
+    self = TypedData_Wrap_Struct(class, &nxt_rctx_dt, (void *)(uintptr_t)arg);
 
     rb_obj_call_init(self, 0, NULL);
 
@@ -96,7 +114,7 @@ nxt_ruby_stream_io_gets(VALUE obj)
     nxt_ruby_ctx_t           *rctx;
     nxt_unit_request_info_t  *req;
 
-    Data_Get_Struct(obj, nxt_ruby_ctx_t, rctx);
+    TypedData_Get_Struct(obj, nxt_ruby_ctx_t, &nxt_rctx_dt, rctx);
     req = rctx->req;
 
     if (req->content_length == 0) {
@@ -152,7 +170,7 @@ nxt_ruby_stream_io_read(VALUE obj, VALUE args)
     long            copy_size, u_size;
     nxt_ruby_ctx_t  *rctx;
 
-    Data_Get_Struct(obj, nxt_ruby_ctx_t, rctx);
+    TypedData_Get_Struct(obj, nxt_ruby_ctx_t, &nxt_rctx_dt, rctx);
 
     copy_size = rctx->req->content_length;
 
@@ -208,7 +226,7 @@ nxt_ruby_stream_io_puts(VALUE obj, VALUE args)
         return Qnil;
     }
 
-    Data_Get_Struct(obj, nxt_ruby_ctx_t, rctx);
+    TypedData_Get_Struct(obj, nxt_ruby_ctx_t, &nxt_rctx_dt, rctx);
 
     nxt_ruby_stream_io_s_write(rctx, RARRAY_PTR(args)[0]);
 
@@ -226,7 +244,7 @@ nxt_ruby_stream_io_write(VALUE obj, VALUE args)
         return Qnil;
     }
 
-    Data_Get_Struct(obj, nxt_ruby_ctx_t, rctx);
+    TypedData_Get_Struct(obj, nxt_ruby_ctx_t, &nxt_rctx_dt, rctx);
 
     len = nxt_ruby_stream_io_s_write(rctx, RARRAY_PTR(args)[0]);