Fix format specifier warnings on 32-bit architectures (i686) (#3791)

During compilation on i686 (32-bit) architecture with GCC 15, format
specifier warnings appear due to type size differences between 32-bit
and 64-bit platforms.

```
server.c: In function 'on_frame_recv_callback':
warning: format '%ld' expects argument of type 'long int', but argument 14
has type 'size_t' {aka 'unsigned int'} [-Wformat=]
  638 |  LM_DBG("h2 header [%d], %p %ld\n", frame->hd.type, frame->headers.nva, frame->headers.nvlen);

dm_impl.c: In function 'dm_avps2json':
warning: format '%ld' expects argument of type 'long int', but argument 15
has type 'int64_t' {aka 'long long int'} [-Wformat=]
  484 |  LM_DBG("%2d. got int64   AVP %s (%u), value: %ld\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->i64);

warning: format '%lu' expects argument of type 'long unsigned int', but argument 15
has type 'uint64_t' {aka 'long long unsigned int'} [-Wformat=]
  494 |  LM_DBG("%2d. got uint64  AVP %s (%u), value: %lu\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->u64);
```

Type sizes differ between 32-bit and 64-bit architectures:

**On x86_64 (64-bit):**
- `size_t` = `unsigned long` (8 bytes)
- `int64_t` = `long int` (8 bytes)

**On i686 (32-bit):**
- `size_t` = `unsigned int` (4 bytes)
- `int64_t` = `long long int` (8 bytes)
- `uint64_t` = `unsigned long long int` (8 bytes)

Use portable C99 format specifiers that work correctly on all
architectures:

- `%zu` for `size_t` (modules/http2d/server.c line 638)
- `%" PRId64` for `int64_t` (modules/aaa_diameter/dm_impl.c line 484)
- `%" PRIu64` for `uint64_t` (modules/aaa_diameter/dm_impl.c line 494)

Assisted-by: Claude (Anthropic) <https://claude.ai>

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
(cherry picked from commit 672e4dd)

Author: lemenkov

modules/aaa_diameter/dm_impl.c

@@ -20,6 +20,7 @@
 
 #include <freeDiameter/extension.h>
 #include <sys/eventfd.h>
+#include <inttypes.h>
 
 #include "../../ut.h"
 #include "../../lib/list.h"
@@ -485,7 +486,7 @@ static int dm_avps2json(void *root, cJSON *avps)
 			break;
 
 		case AVP_TYPE_INTEGER64:
-			LM_DBG("%2d. got int64   AVP %s (%u), value: %ld\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->i64);
+			LM_DBG("%2d. got int64   AVP %s (%u), value: %" PRId64 "\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->i64);
 			num_val = (double)h->avp_value->i64;
 			break;
 
@@ -495,7 +496,7 @@ static int dm_avps2json(void *root, cJSON *avps)
 			break;
 
 		case AVP_TYPE_UNSIGNED64:
-			LM_DBG("%2d. got uint64  AVP %s (%u), value: %lu\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->u64);
+			LM_DBG("%2d. got uint64  AVP %s (%u), value: %" PRIu64 "\n", i, dm_avp.avp_name, h->avp_code, h->avp_value->u64);
 			num_val = (double)h->avp_value->u64;
 			break;
 

modules/http2d/server.c

@@ -635,7 +635,7 @@ static int on_frame_recv_callback(nghttp2_session *session,
 	switch (frame->hd.type) {
 	case NGHTTP2_DATA:
 	case NGHTTP2_HEADERS:
-		LM_DBG("h2 header [%d], %p %ld\n", frame->hd.type, frame->headers.nva, frame->headers.nvlen);
+		LM_DBG("h2 header [%d], %p %zu\n", frame->hd.type, frame->headers.nva, frame->headers.nvlen);
 		/* Check that the client request has finished */
 		if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
 			stream_data =