fix typo in top-level clean-stage*

[Alexandre Oliva]

This patch fixes a typo/thinko in the top-level Makefile, that caused
make clean-stage[123] to print an error about the @[ command not being
found.  I'm not sure it caused any other ill effects.

Tested on amd64-linux-gnu.  Checking in.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}