- 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

require"package"
msgbox = package.loadlib("user32","MessageBoxA")
print(msgbox)
dcCall(msgbox,"iSSi)v",0,"hello","world",0)
sqrt = package.loadlib("msvcrt","sqrt")
print(sqrt)
x = dcCall(sqrt,"d)d",144)
-- print(x)