dload.c : drop the specific handling of file: url.

Before commit fc48dc31, file:/// urls forced the use of the internal
downloader (libdownload), because the default XferCommand, wget, does not
handle them.  We tried to move away from forcing usage of libdownload, so
this commit implemented the handling of file:/// urls manually. However,
this implementation is way too basic. It does not handle the progress bar,
thus nothing at all appears in pacman's output when a file: repo is
synchronized, or when a file is downloaded from a sync repo. Also, it is not
able to detect when the repo is already up-to-date. When libdownload was
used, both were handled.

It seems better to just drop this implementation for now. All users who use
libdownload will get the much better file:// handling back. For the users of
XferCommand, it will be more problematic, but they have several options:

1) Switch to a downloader handling file:// (wget doesn't, but curl does for
example).
2) Drop the file:// repo, and set up light http or ftp servers instead.
Consider that going that way would make this repo available for the whole
local network, which can be useful.
3) Switch back to libdownload, which works perfectly for many users.

Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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