Apparent build race(s), r315238 -> r315298

[Simon J. Gerraty]

Ngie Cooper (yaneurabeya) <yaneurabeya at gmail.com> wrote:
> Alternatively, could you please revert just r313650 in another branch/workspace (I wonder if changing from .OBJDIR to OBJTOP had some unintended consequences that unrooted issues with how bmake evaluates paths)?

The only change to dir handling in recent bmake is handling of -C where
arg involves symlinks - provided that refers to same dir as getcwd, the
logical value is used.