git-archive --format=zip: use default version ID

Use 10 for the "version needed to extract" field.  This is the
default value, and we want to use it because we don't do anything
special.  Info-ZIP's zip uses it, too.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

archive-zip.c

@@ -214,7 +214,7 @@ static int write_zip_entry(const unsigned char *sha1,
 
 	copy_le32(dirent.magic, 0x02014b50);
 	copy_le16(dirent.creator_version, 0);
-	copy_le16(dirent.version, 20);
+	copy_le16(dirent.version, 10);
 	copy_le16(dirent.flags, 0);
 	copy_le16(dirent.compression_method, method);
 	copy_le16(dirent.mtime, zip_time);
@@ -236,7 +236,7 @@ static int write_zip_entry(const unsigned char *sha1,
 	zip_dir_entries++;
 
 	copy_le32(header.magic, 0x04034b50);
-	copy_le16(header.version, 20);
+	copy_le16(header.version, 10);
 	copy_le16(header.flags, 0);
 	copy_le16(header.compression_method, method);
 	copy_le16(header.mtime, zip_time);