Fixing installation of Kyuafiles

[Garrett Cooper]

> On Jan 9, 2014, at 15:34, Julio Merino <julio at meroh.net> wrote:
> 
> Hello,
> 
> The bin/sh and bin/test tests are broken because they cannot be run as root,
> yet the testing machines are currently running stuff as root.  This is easy
> to fix by adding a require_user="unprivileged" property to the tests.
> 
> I was going to fix this by adding manually-crafted Kyuafile files that do
> the above in bin/sh/tests/ and bin/test/tests/ and setting KYUAFILE=yes in
> the corresponding Makefile files... but unfortunately that does not work
> with NO_CLEAN builds.
> 
> The problem is that bsd.test.mk generates Kyuafile files in the obj directory
> and setting KYUAFILE=yes means that make will _still_ see the Kyuafile in the
> obj directory and not the one that just appeared in src.
> 
> Does the attached patch seem reasonable to prevent this in the future?
> 
> The patch does not fix current build trees with NO_CLEAN, but because
> WITH_TESTS is not yet the default I don't think it's a big deal.
> 
> Thank you.
> <kyuafiles.diff>

Why not use ${.TARGET} instead of Kyuafile.auto?