gpgv: Merge all keyrings into a single one again

gpgv is quite picky, it takes at most 40 keyrings but it also doesn't
even take keyrings with : in the name, generating an ERROR message
instead.

So instead let's always merge the configured keyrings for the source
into a single one.

While we are at it, since we are merging now, let's also add some
rudimentary error checking to what we write into the merged keyring:
If copying into it fails, we should abort.

Reported-by: SuShY on IRC

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