uboot-ar71xx: fix compile on recent mac os x versions

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32750 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/uboot-ar71xx/patches/022-getline_backport.patch

@@ -0,0 +1,21 @@
+--- a/tools/os_support.c
++++ b/tools/os_support.c
+@@ -23,6 +23,6 @@
+ #ifdef __MINGW32__
+ #include "mingw_support.c"
+ #endif
+-#ifdef __APPLE__
++#if defined(__APPLE__) && __DARWIN_C_LEVEL < 200809L
+ #include "getline.c"
+ #endif
+--- a/tools/os_support.h
++++ b/tools/os_support.h
+@@ -28,7 +28,7 @@
+ #include "mingw_support.h"
+ #endif
+ 
+-#ifdef __APPLE__
++#if defined(__APPLE__) && __DARWIN_C_LEVEL < 200809L
+ #include "getline.h"
+ #endif
+