1) Update to exiscan-4.12-22, which closes a number of buffer overflows

   and incorporates a lot of fixes.

   WARNING, this version of exiscan is not entirely backward-compatible
   with the previous one:

   *	The following configuration options have been replaced with
	compile-time definitions and thus must be removed from your
	Exim configure file if specified there:

	exiscan_spamd_buffer_max_chunks
	exiscan_spamd_buffer_init_chunk
	exiscan_av_buffer_max_chunks
	exiscan_av_buffer_init_chunk

   *	Because of changes in the way MIME handling is implemented,
	the following should be added to the Exim configure file to
	maintain the original behaviour (which was to unpack MIME
	messages):

	exiscan_demime_condition = 1

2) Fix handling of SIGCHLD in redirection processes, which resulted
   in redirection processes vanishing.

3) Bump PORTREVISION accordingly.

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