- further fixes of inccorect overflow errors for int (and long on LLP64 systems) * prev commit had bugs * added overflow tests for also int, long, long long (for both, lp64 and llp64) - while at it, fixing a reference leak when not using python with utf8 caching

#!/bin/sh
gcc -I../../../dyncall/dyncall shdc.c ../../../dyncall/dyncall/libdyncall_s.a ../../../dyncall/dynload/libdynload_s.a -o ./shdc