chicken-install doesn't update outdated cached eggs

[Mario Domenech Goulart]

chicken-install doesn't update an egg in case an outdated version of it is cached.

Example to illustrate the problem:

$ chicken-install -purge srfi-13
$ chicken-install srfi-13:0.3.1
$ chicken-status srfi-13
srfi-13 ..................................................... version: 0.3.1
$ chicken-install srfi-13
$ chicken-status srfi-13
srfi-13 ..................................................... version: 0.3.1

The expected output (according to Felix) of the second execution of chicken-status should show 0.3.2, which is the latest version of srfi-13 at the time of writing of this ticket.

[evhan]

Fixed by 08dd951d.