[DRE-maint] Bug#933107: ruby-rubymail: Deprecation warnings with Ruby 2.4 (constant ::Fixnum is deprecated)

[Gerald Turner]

Control: tags -1 patch

Attached is a trivial patch which s/Fixnum/Integer/.  I've tested it
with the feed2imap program (from feed2imap package).

-- 
Gerald Turner <gturner at unzane.com>        Encrypted mail preferred!
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