format-patch: resurrect extra headers from config

Once again, if you have

	[format]
		headers = "Origamization: EvilEmpire\n"

format-patch will add these headers just after the "Subject:" line.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/revision.h b/revision.h
index 75796bc138..7d85b0f2e9 100644
--- a/revision.h
+++ b/revision.h
@@ -61,6 +61,7 @@ struct rev_info {
 	int		nr, total;
 	const char	*mime_boundary;
 	const char	*add_signoff;
+	const char	*extra_headers;
 
 	/* special limits */
 	int max_count;