Glitch compiling 4.0.0 final

[Daniel Johnson]

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I've encountered a minor compile problem with DHCP v4.0.0.
client/dhclient.c and server/dhcpd.c declare an "int local_family_set",
but only use it if DHCPv6 support is being compiled in.  Warnings are
being promoted to Errors, so if configured with --disable-dhcpv6 it
does not compile.

The simple fix was to enclose the variable declaration in
"#ifdef DHCPv6" "#endif /* DHCPv6 */".

This machine is Linux 2.4.21, Slackware 9, gcc 3.2.2

Daniel Johnson
Progman2000 at usa.net

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