Fix spurious removal of a trailing character from the hostarch string on x86_64
# Checking cross compile
$hostos = `uname -s | sed -e s/\-.*//`; chop($hostos);
-$hostarch = `uname -m | sed -e s/i.86/x86/`;chop($hostarch);
+$hostarch = `uname -m | sed -e s/i.86/x86/`;
$hostarch = `uname -p` if ($hostos eq "AIX" || $hostos eq "SunOS");
chop($hostarch);
$hostarch = "x86_64" if ($hostarch eq "amd64");
