Bump buidlroot version to 2018.02.6

bsp/buildroot/package/lbase64/0001-retro-compatible-with-Lua-5.1.patch

@@ -0,0 +1,20 @@
+retro compatible with Lua 5.1 C/API
+
+Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
+
+Index: b/lbase64.c
+===================================================================
+--- a/lbase64.c
++++ b/lbase64.c
+@@ -111,7 +111,11 @@
+ 
+ LUALIB_API int luaopen_base64(lua_State *L)
+ {
++#if LUA_VERSION_NUM >= 502
+  luaL_newlib(L,R);
++#else
++ luaL_register(L,MYNAME,R);
++#endif
+  lua_pushliteral(L,"version");			/** version */
+  lua_pushliteral(L,MYVERSION);
+  lua_settable(L,-3);