Add new USB IDs.

PR:		193775
MFC after:	1 week
Reference the test case "packs" to fix warnings

Put the various atf_tc_pack_t variables generated by ATF_TC to use in
the macros_h_test.c file so that we prevent some build warnings (and
thus some build errors) with clang and -Wunused.

Obtained from:  atf (git 70126d013db25c72539803f19f7e00baddacdf51)
When populating the dvd/packages/ directory, create
a symlink to All/pkg-*.txz in the Latest/ directory.

This allows 'pkg bootstrap' to work out-of-box if
the REPOS_DIR environment is properly set.

Tested on:	stable/10@r271848
MFC after:	3 days
X-MFC-10.1:	yes
Sponsored by:	The FreeBSD Foundation
unistd: drop argument names from setpgrp(3) prototype.

They are useless and don't match the style of the header.
While here adjust the comment with tabs.

Suggested by:	kevinlo
awk: Use random(3) instead of rand(3)

While none of them is considered even near to cryptographic
level, random(3) is a better random generator than rand(3).

Use random(3) for awk as is done in other systems.

Thanks to Chenguang Li for discussing this in the lists
and submitting the patch upstream.

PR:		193147
MFC after:	5 weeks