This updates mkclean to 0.8.6 and modifies the one install command
so that all three binaries it builds get installed, namely:
mkclean, mkcleanreg, and mkWDclean. It compiles and tests
using llvm-2335, gcc-4.2.1, and clang-2.0.
ClosesHomebrew/homebrew#8031.
Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>