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

configure.ac

@@ -688,6 +688,7 @@ if test "$JANSSON_BUNDLED" = "no" ; then
 		AC_MSG_NOTICE(*** use './configure --with-jansson-bundled')
 		exit 1
 	fi
+	JANSSON_DEFINE_JSON_INT()
 else
 	PBX_JANSSON=1
 fi