Bug#783982: D-i: preseed from floppy no longer works !

I'd prefer not to introduce any new dependecies, for portability reasons.
Would like to have floppy support back.

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Follow-Ups:
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Geert Stappers <stappers@stappers.nl>

References:
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Alexey Eromenko <al4321@gmail.com>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Geert Stappers <stappers@debian.org>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Alexey Eromenko <al4321@gmail.com>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Geert Stappers <stappers@stappers.nl>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Alexey Eromenko <al4321@gmail.com>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Ben Hutchings <ben@decadent.org.uk>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Alexey Eromenko <al4321@gmail.com>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Ben Hutchings <ben@decadent.org.uk>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Alexey Eromenko <al4321@gmail.com>
- Bug#783982: D-i: preseed from floppy no longer works !
  - From: Ben Hutchings <ben@decadent.org.uk>