add dummy file so quicklisp dir isn't missing when using git

git-svn-id: http://acl2-books.googlecode.com/svn/trunk@2513 303c5b2c-9740-0410-b014-fd8f9db7be32
Attempt to fix ongoing std/strings/defs-program dependency problem by making dependencies on package files more explicit

git-svn-id: http://acl2-books.googlecode.com/svn/trunk@2514 303c5b2c-9740-0410-b014-fd8f9db7be32