0.9.1: v3 key 'expiration date'

[ralf.stephan at fitug.de]

This just happened:
1. generate a key, set expiration date
2. <do other things, deleting etc.>
3. edit a v3 secret key, try to set expiration date
- output: "You can't change...
4. save
5. key has expiration date from 1. and gpg reports that pubkey
   and seckey differ.

Now my limited understanding of g10/keyedit.c:menu_expire()
prevents me from submitting a patch right away but I'll take
an easy shot and guess that in the for loop the exp.date is
set before v3 detection.  But hey...

Hope this is reproducible,
ralf
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