Improve bsd.progs.mk feature parity with bsd.prog.mk

In particular..
1. Only pass along variables if they're defined; this will allow SRCS
   to be automatically populated via bsd.prog.mk.
2. Pass along depend so make depend automagically works.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Put pjdfstest in a more logical spot and don't bail
if the user runs make test on the directory

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Integrate in testcases for bin/{mv,pax,test}

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Checkpoint work at integrating in libc tests from NetBSD

A number of them had to be disabled due to differences in
OS support between FreeBSD and NetBSD.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Fix the path for atf-run.hooks

XXX: this seems wrong; probably should be nuked..

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Merge branch 'master' into atf-tools-regression-convert