lang/clang-devel install fails when DOCS not set

[Doug Barton]

I got this:

gmake[1]: Leaving directory
`/home/tmp/frontier/ports-svn/head/lang/clang-devel/work/llvm-3.2.r160283/tools/clang/unittests'
rmdir: /usr/local/share/doc/clang/html/img: No such file or directory
*** Error code 1

Stop in /frontier/ports-svn/head/lang/clang-devel.
*** Error code 1

Stop in /frontier/ports-svn/head/lang/clang-devel.

Turning on DOCS makes it work.

Also, man pages are not usually considered part of DOCS.

-- 

    Change is hard.