git-svn: Remove unused use of File::Temp

The use line was added in ffe256f9. File::Temp calls were later moved
to Git.pm in 0b19138b, but that commit neglected to remove the
now-redundant import.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Eric Wong <normalperson@yhbt.net>

git-svn.perl

@@ -4000,7 +4000,6 @@ use vars qw/@ISA/;
 use strict;
 use warnings;
 use Carp qw/croak/;
-use File::Temp qw/tempfile/;
 use IO::File qw//;
 use vars qw/$_ignore_regex/;