Re: Symbol's function definition is void when listing packages

[raman <raman@xxxxxxxxxxx>]

Tim is correct, there is a dependency on calendar that I thought the
compiler had resolved.
I've added a (require 'calendar) to emacspeak-package.el to fix the
issue for now.

Background:

Packages on archives like melpa use version numbers that are dates -- so
you'll see foo-20150101  --- and hearing that spoken as foo-20 million
... is not useful.

Module emacspeak-package.el uses some of the smart pronouncers in
emacspeak-pronounce.el (that module already pulls in calendar during
compilation).  But it turns out that if you  haven't yet loaded calendar
in  a running session, then  the function calendar-date-string is
unavailable at runtime.

Victor -- no backtrace needed.  
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