- 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

user32 = dcLoad("user32")
msgbox = dcFind(user32,"MessageBoxA")
print(msgbox)
dcCall(msgbox, "iSSi)v", 0, "hello", "world", 0)

dcCall(msgbox, "iSSi)v", 0, "hello", "world2", 0)