make the elf cpu test try both byte orders.
perhaps bytes 18 and 19 are actually a short?

Reference: /n/sources/patch/applied/file-elf-bo
Date: Tue Jan  4 15:41:13 CET 2005

--- /sys/src/cmd/file.c	Tue Jan  4 15:41:13 2005
+++ /sys/src/cmd/file.c	Tue Jan  4 15:41:13 2005
@@ -1235,7 +1235,16 @@
 	if (memcmp(buf, "\x7fELF", 4) == 0){
 		if (!mime){
 			int n = (buf[19] << 8) | buf[18];
-			char *p = (n > 0 && n < nelem(cpu) && cpu[n])? cpu[n]: "unknown";
+			char *p = "unknown";
+
+			if (n > 0 && n < nelem(cpu) && cpu[n])
+				p = cpu[n];
+			else {
+				/* try the other byte order */
+				n = (buf[18] << 8) | buf[19];
+				if (n > 0 && n < nelem(cpu) && cpu[n])
+					p = cpu[n];
+			}
 			print("%s ELF executable\n", p);
 		}
 		else