[STABLE-BRANCH-1-4 PATCH] g10: secmem leak

[Ineiev]

Hello,

I attach a patch for GnuPG-bug 1371. in short, secure memory
is leaked because proc_parameter_file() adds new entries
to the head of the list of parameters, and these entries
aren't accessible to the caller that releases the list.

When multiple keys are generated in a batch, the secure
memory is fragmented very soon, so more keys can't be generated.

The patch adds the new parameters next to the head
of the list instead, so they can be released in the caller.

BTW, the 2-0 branch is also affected and can be fixed
in a similar way; the 2-1 branch is not affected, because
the new parameters are appended to the tail of the list
with append_to_parameter().

Thank you!
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