ll_map: disable interface name caching code

function                                             old     new   delta
find_by_index                                          -      26     +26
static.icache                                          4       -      -4
ll_idx_n2a                                            71      59     -12
static.ncache                                         16       -     -16
ll_index_to_flags                                     40      24     -16
xll_name_to_index                                    206     104    -102
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 0/3 up/down: 26/-150)          Total: -124 bytes

   text    data     bss     dec     hex filename
 734703    3040   14440  752183   b7a37 busybox_old
 734599    3040   14416  752055   b79b7 busybox_unstripped


diff --git a/networking/libiproute/ll_map.h b/networking/libiproute/ll_map.h
index abb6404..2dfc844 100644
--- a/networking/libiproute/ll_map.h
+++ b/networking/libiproute/ll_map.h
@@ -2,12 +2,12 @@
 #ifndef __LL_MAP_H__
 #define __LL_MAP_H__ 1
 
-extern int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
-extern int ll_init_map(struct rtnl_handle *rth);
-extern int xll_name_to_index(const char * const name);
-extern const char *ll_index_to_name(int idx);
-extern const char *ll_idx_n2a(int idx, char *buf);
-extern int ll_index_to_type(int idx);
-extern unsigned ll_index_to_flags(int idx);
+int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
+int ll_init_map(struct rtnl_handle *rth);
+int xll_name_to_index(const char * const name);
+const char *ll_index_to_name(int idx);
+const char *ll_idx_n2a(int idx, char *buf);
+/* int ll_index_to_type(int idx); */
+unsigned ll_index_to_flags(int idx);
 
 #endif /* __LL_MAP_H__ */