[cmucl-imp] June snapshot

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