(magic): Add an entry for new lzma format. Proposed by Lasse Collin

src/buffer.c

@@ -204,7 +204,8 @@ enum compress_type {
   ct_none,
   ct_compress,
   ct_gzip,
-  ct_bzip2
+  ct_bzip2,
+  ct_lzma
 };
 
 struct zip_magic
@@ -221,6 +222,7 @@ static struct zip_magic const magic[] = {
   { ct_compress, 2, "\037\235", "compress", "-Z" },
   { ct_gzip,     2, "\037\213", "gzip", "-z"  },
   { ct_bzip2,    3, "BZh",      "bzip2", "-j" },
+  { ct_lzma,     6, "\xFFLZMA", "lzma", "-a" }, /* FIXME: ???? */
 };
 
 #define NMAGIC (sizeof(magic)/sizeof(magic[0]))