diff.c: convert show_stats to use emit_diff_symbol
We call print_stat_summary from builtin/apply, so we still need the version with a file pointer, so introduce print_stat_summary_0 that uses emit_string machinery and keep print_stat_summary with the same arguments around. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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