[PATCH] Fix the "NTPv7" bug

[Paul Marks]

When using busybox ntpd with an NTPv3 client and NTPv4 server (or vice
versa), the version numbers can be ORed together, yielding the bogus
value 7.

This 1-line patch ensures that only the Leap Indicator bits are copied
from the server status.

I've done before/after tests with Chrony and Windows 7's "Internet
Time" feature, and this patch fixed both cases.

Related bug:
https://bugs.busybox.net/show_bug.cgi?id=5120
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