added "#define PRECISE_SYMLINKS" to the amd config header - this
solves a problem with the amd "-type:=direct" mounts and /bin/sh
giving a "readlink failed" if you cd'ed to a "-type:=direct" mounted
directory
i got this from david mazieres as a result of giving him our (mostly
doug rabsons) fixes for the amd "-type:=direct" mounts and telling
them (also some NetBSD people were interested) about my only problem
running these fixes (which is now solved too :-)
