#1300 Fix 64 bit big endian issue in udpTable_next_entry

[Eric Snowberg]

On a 64 bit big endian system the following unit test fails with net-snmp version 5.5.2.1:

61:testing if snmpnetstat finds the running agent in udpTable...FAIL

This is because addr is defined as a long instead of a in_addr_t within udpTable_next_entry.

Patch has been tested on 64 bit SPARC Linux 2.6.39

[Niels Baggesen]

Thank. Applied.