fix: Add CRLF support in patch header filename parsing

Fix the filename parsing from patch headers to properly handle CRLF line
endings. Previously, the code only checked for '\n' as line ending,
which caused incorrect parsing when processing patches with Windows-style
CRLF line endings.

This fixes issues where filenames in patches with CRLF line endings were
not being correctly extracted, particularly affecting Windows-generated
patch files.

Signed-off-by: Liu Chao <chaoliu719@gmail.com>

Author: chaoliu719

src/diff.c

@@ -1092,7 +1092,7 @@ read_timestamp (const char *timestamp, struct tm *result, long *zone)
 char *
 filename_from_header (const char *header)
 {
-	int first_space = strcspn (header, " \t\n");
+	int first_space = strcspn (header, " \t\n\r");
 	int h = first_space;
 	while (header[h] == ' ') {
 		int i;
@@ -1102,10 +1102,10 @@ filename_from_header (const char *header)
 		if (!read_timestamp (header + h + i, NULL, NULL))
 			break;
 		h += i + 1;
-		h += strcspn (header + h, " \t\n");
+		h += strcspn (header + h, " \t\n\r");
 	}
 
-	if (header[h] == '\n' && h > first_space)
+	if ((header[h] == '\n' || header[h] == '\r') && h > first_space)
 		/* If we couldn't see a date we recognized, but did see
 		   at least one space, split at the first. */
 		h = first_space;