LibBT 1.03 Fixes Errors In Compact Mode

LibBT version 1.03 fixes a nasty bug in the handling of compact responses from trackers that has become more obvious as trackers start implementing the protocol. Earlier versions of LibBT could not make outbound connections to peers that were returned in compact mode due to an error in how their port numbers were remembered.

LibBT 1.03 also fixes a couple of ANSI C violations that kept the code from compiling on GCC 2.96, and caused coredumps in btcheck when it was run with invalid parameters.