[cmucl-imp] June snapshot

[Raymond Toy]

The June snapshot has been tagged and binaries will be available soon.

Just a few minor changes this month:

o :CMUCL is a *FEATURE* now.  (I make that mistake a lot, even though I
should know better.)
o Bug fix for an error that occurs when opening a file containing an
escaped "[" character.
o Added -unidata switch to allow user to specify the full path to the
unidata.bin file to be used.

This change requires a cross-compile due to the new static symbol.  Use
boot-2011-04-1-cross.lisp as the cross-compile script.

Ray