mailinfo: skip bogus UNIX From line inside body

Sometimes people just include the whole format-patch output in
the commit e-mail.  Detect it and skip the bogus ">From " line.

Signed-off-by: Junio C Hamano <junkio@cox.net>

mailinfo.c

@@ -237,10 +237,17 @@ static int eatspace(char *line)
 #define SEEN_FROM 01
 #define SEEN_DATE 02
 #define SEEN_SUBJECT 04
+#define SEEN_BOGUS_UNIX_FROM 010
 
 /* First lines of body can have From:, Date:, and Subject: */
 static int handle_inbody_header(int *seen, char *line)
 {
+	if (!memcmp(">From", line, 5) && isspace(line[5])) {
+		if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
+			*seen |= SEEN_BOGUS_UNIX_FROM;
+			return 1;
+		}
+	}
 	if (!memcmp("From:", line, 5) && isspace(line[5])) {
 		if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
 			*seen |= SEEN_FROM;