firmware-utils: fix build on not Linux

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

tools/firmware-utils/Makefile

@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME := firmware-utils
-PKG_RELEASE := 8
+PKG_RELEASE := 9
 
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/kernel.mk

tools/firmware-utils/src/mkzyxelzldfw.c

@@ -17,7 +17,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <netinet/in.h>
-#include <linux/limits.h>
+#include <limits.h>
 #include "md5.h"
 
 #define ZYXEL_MAGIC	0xdeadbeaf