Teach file about 32- and 64-bit Mach-O executables.
Determining architecture requires more work (not
quite as bad as iself(), but won't fit in long0).

Reference: /n/sources/patch/applied/file-knows-mach-o
Date: Mon Sep  6 00:59:26 CES 2010
Signed-off-by: a@9srv.net

--- /sys/src/cmd/file.c	Mon Sep  6 00:58:31 2010
+++ /sys/src/cmd/file.c	Mon Sep  6 00:58:29 2010
@@ -601,6 +601,8 @@
 	 * thus the numbers appear reversed in this table.
 	 */
 	0xad4e5cd1,	0xFFFFFFFF,	"venti arena\n", OCTET,
+	0xfeedface,	0xFFFFFFFF,	"32-bit Mach-O executable\n",	OCTET,
+	0xfeedfacf,	0xFFFFFFFF,	"64-bit Mach-O executable\n",	OCTET,
 };
 
 int