Makefile, dist/prepare: allow $OBJ to be overridden cleanly
Makefile, dist/prepare: allow $OBJ to be overridden cleanly

If $OBJ is set – whether in environment or in `make` command line –
treat it as a temporary override, and do not touch the $HOSTOBJ symlink.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks