[PATCH] Fix build error for kernels headers < 3.17

[Petr Vorel <petr vorel gmail com>]

platform/nm-platform.c:974:71: error: 'IN6_ADDR_GEN_MODE_NONE' undeclared (first use in this function)
    return _nm_platform_uint8_inv (pllink->inet6_addr_gen_mode_inv) == IN6_ADDR_GEN_MODE_NONE;

Based on logic from 37f11fbd

Signed-off-by: Petr Vorel <petr vorel gmail com>
---
 src/platform/nm-platform.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/platform/nm-platform.c b/src/platform/nm-platform.c
index 8803377..14e5726 100644
--- a/src/platform/nm-platform.c
+++ b/src/platform/nm-platform.c
@@ -39,6 +39,12 @@
 #include "nm-enum-types.h"
 #include "nm-core-internal.h"
 
+#if HAVE_LIBNL_INET6_ADDR_GEN_MODE && HAVE_KERNEL_INET6_ADDR_GEN_MODE
+#include <linux/if_link.h>
+#else
+#define IN6_ADDR_GEN_MODE_NONE  1
+#endif
+
 #define ADDRESS_LIFETIME_PADDING 5
 
 G_STATIC_ASSERT (sizeof ( ((NMPlatformLink *) NULL)->addr.data ) == NM_UTILS_HWADDR_LEN_MAX);
-- 
1.8.0