Instead of ======..., use the standard separator for a multi-file
diff, which is, per POSIX,

    "diff %s %s %s\n", <diff_options>, <filename1>, <filename2>

This makes regression.diffs behave more like a proper diff file, for
use with other tools.  And it shows the diff options used, for
clarity.

Discussion: https://www.postgresql.org/message-id/70440c81-37bb-76dd-e48b-b5a9550d5613@2ndquadrant.com