multiversion lua, buildlink3 and graphviz

[Richard PALO <richard.palo%free.fr@localhost>]

Since the recent multiversion lua reorganisation, there seems to be a 
little bit of fallout.  One package, graphviz, provides lua scripts, but 
looks for 'lua' during configure.

From a discussion off-list with wiz@ concerning graphviz

> well, this worked for me (complete build/package):
> >diff --git a/graphics/graphviz/options.mk b/graphics/graphviz/options.mk
> >index 0ccd5ef..586f4cb 100644
> >--- a/graphics/graphviz/options.mk
> >+++ b/graphics/graphviz/options.mk
> >@@ -114,6 +114,7 @@ USING_SWIG= no
> > .if !empty(PKG_OPTIONS:Mlua)
> > USING_SWIG=    yes
> > .include "../../lang/lua/buildlink3.mk"
> >+.include "../../lang/lua/tool.mk"
> > PLIST.lua=             yes
> > .else
> > CONFIGURE_ARGS+=       --disable-lua
>
> I believe, though, that lua/buildlink3.mk should probably directly include
> lua/tool.mk... just to avoid this sort of hassle!

Perhaps lua/buildlink3.mk could add tools.mk after

> .include "../../lang/lua/luaversion.mk"
> .include "${LUA_PKGSRCDIR}/buildlink3.mk"

in order to avoid this particular, perhaps commonplace, problem..