cmake: link libjeffpc with libsocket and libnsl
cmake: link libjeffpc with libsocket and libnsl

On Illumos and Solaris, these are needed for xdr_opaque & friends.

Signed-off-by: Josef 'Jeff' Sipek <a620f141433c70aa9e43778305a6c68cbfadfb25@josefsipek.net>

jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc