Properly working make clean when in group mode

Until now, when you ran `make clean', all the directories under
`$(BDIR)/tex/' would be deleted except for `macros' and `build'. This was
good for the single-user mode. But in group mode, this would delete the
user-specific TeX build directory because its called `build-USER', not
`build'.

With this commit, to fix the problem, we define the new `texbtopdir' and
based on the group condition, and use that to specify which directory to
not delete.

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