iproute2: fixes to compile on some systems.

1. Put the declarations of strlcpy and strlcat inside
   an #ifdef NEED_STRLCPY. Their declarations were already in a
   similar #ifdef.
2. In bpf_scm.h, include sys/un.h for struct sockaddr_un.
3. In utils.h, include time.h for struct timeval.

Tested: builds on ubuntu 14.04 with "make clean distclean; ./configure && make -j64"
Tested: 4.14.1 builds on Android with Android-specific #ifndefs for missing library code
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>

include/bpf_scm.h

@@ -3,6 +3,7 @@
 
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <sys/un.h>
 
 #include "utils.h"
 #include "bpf_elf.h"

include/utils.h

@@ -6,6 +6,7 @@
 #include <resolv.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <time.h>
 
 #include "libnetlink.h"
 #include "ll_map.h"
@@ -256,7 +257,9 @@ int make_path(const char *path, mode_t mode);
 char *find_cgroup2_mount(void);
 int get_command_name(const char *pid, char *comm, size_t len);
 
+#ifdef NEED_STRLCPY
 size_t strlcpy(char *dst, const char *src, size_t size);
 size_t strlcat(char *dst, const char *src, size_t size);
+#endif
 
 #endif /* __UTILS_H__ */