rtp_engine: rtcp_report_to_json can overflow the ssrc integer value

When writing an RTCP report to json the code attempts to pack the "ssrc" and
"source_ssrc" unsigned integer values as a signed int value type. This of course
means if the ssrc's unsigned value is greater than that which can fit into a
signed integer value it gets converted to a negative number. Subsequently, the
negative value goes out in the json report.

This patch now packs the value as a json_int_t, which is the widest integer type
available on a given system. This should make it so the value no longer
overflows.

Note, this was caught by two failing tests hep/rtcp-receiver/ and
hep/rtcp-sender.

Change-Id: I2af275286ee5e795b79f0c3d450d9e4b28e958b0

include/asterisk/autoconfig.h.in

@@ -6,6 +6,9 @@
 
 #include "asterisk/buildopts.h" /* IWYU pragma: export */
 
+/* Define to 'long' or 'long long' */
+#undef AST_JSON_INT_T
+
 /* Define to 1 if internal poll should be used. */
 #undef AST_POLL_COMPAT
 

include/asterisk/json.h

@@ -81,6 +81,11 @@
 
 /*!@{*/
 
+/*!
+ * \brief Primarily used to cast when packing to an "I" type.
+ */
+typedef AST_JSON_INT_T ast_json_int_t;
+
 /*!
  * \brief Initialize the JSON library.
  */