[flashrom] [PATCH] warn the user if flashrom is x months old

[Stefan Tauner]

i had the idea to implement an expiration date for flashrom binaries
(i.e. a time bomb). in the case distributions ship ancient binaries
(in the future) this may save a bunch of hardware.

i noted two reactions back then when i proposed this idea on IRC in my
todo.txt:
 <twice11> If I validated software to work on some system, I don't want
 it to suddenly break one year later.
 <agaran> twice11: but kind notify that version you use is %d days old
 (and repeated every multiple of time or 100days or so) could be nice

this proof of concept is probably not mergeable - especially the
strptime() might be a problem (alternatives welcome), but i still think
it is worth to think about something like this. comments?