Fix e-d-s so that it does not try to allocate all available memory on 64-bit
platforms. The fix committed is different from that in the PR since the
purpose of this memory was not clarified by the Evolution developers. The
fix committed casts the require memory size to an unsigned 32-bit integer.
Since the memory required should never exceed the maximum capacity of an
uint32_t, this is not a problem.
Thanks to anholt for tracking down this problem.
See http://bugzilla.gnome.org/show_bug.cgi?id=331099 for more details.