related to issue #320 and mailing list comment https://lists.ntpsec.org/pipermail/devel/2017-May/004519.html
this patch makes the Trimble refclock depend on libparse

For some odd reason initgroups() tkes an int, instead of git_t, for
the second argument.  Even though the 2nd argument is clearly a gid.

Apple makes this work by making gid_t a unit32_t and so an int can
hold it.

Trevor N authored Jun 08, 2017 and Gary E. Miller committed Jun 08, 2017

Sorry for the delay, this should fix issue #320

Signed-off-by: Gary E. Miller <gem@rellim.com>

netof() never did anything useful with IPv4, and was never used
on IPv6.  Not really useful on IPv6, it just masks an IPv6 to /64.

One small step to accepting CIDR notation.

This is now accepted: restrict 10.169.0.0/16
But is is the same as: restrict 10.169.0.0 mask 255.255.255.255

The former is a SysV compatibility typedef on many systems and we need to set
fewer magic defines per standards(5) on Solaris if we just do a global search
and replace.

struct msghdr has all of the members specified by POSIX, if you set the defines
correctly.

Fixes Gitlab issue #342

Either receives a command through -c or -p and won't have a prompt,
or it does not and will have a prompt. The -i switch can't do anything.