test -z and test -n DESTDIR support

[James Smith]

Hello,

I've found two spots where DESTDIR support is omitted. I tried to  
track down where the problem is in the autoconf source without  
success, so I present to you a diff on git OpenVPN's Makefile.in (see  
attached). I *think* the bug is in lib/autoconf/programs.m4 from my  
grepping but I really am not sure.

I built autoconf from git (as at 2012-07-25 01:41 UTC), following the  
instructions in README-hacking. OpenVPN source came from git (as at  
2012-07-25 02:28 UTC). Using my built autoconf, I issued autoreconf  
-vi in my OpenVPN git directory. The generated Makefile.in needed to  
be corrected as in the attached diff.

I've also attached tests/testsuite.log as requested on the autoconf home page.

Note this seems to happen with any Makefile.in, but I know for sure it  
happens with OpenVPN. It's probable there were other Makefile.ins in  
the OpenVPN tree that needed patching, but it looks like the bug comes  
from one source, so it didn't seem necessary to send diffs for them too.

Hope this helps.
James

testsuite.log
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openvpn-git-destdir.diff
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