lib/binrpc modules/ctl utils/kamcmd : set UNIX_PATH_MAX to lowest common value
sockaddr_un.sun_path[] seem to be either 104 or 108 in following Unices:
104 - NetBSD, OpenBSD, FreeBSD, DragonFly BSD, MINIX, XNU(Apple OS X)
108 - illumos, Solaris, Linux