Use scopeguard from libbase_headers and delete the copy

A recent change makes libbase_headers available to the tethering apex.

Test: m
Change-Id: Id4f30f48bd65175e17c419230a8e7ebf5339d713
diff --git a/staticlibs/native/tcutils/tcutils.cpp b/staticlibs/native/tcutils/tcutils.cpp
index c82390f..db0dd15 100644
--- a/staticlibs/native/tcutils/tcutils.cpp
+++ b/staticlibs/native/tcutils/tcutils.cpp
@@ -20,8 +20,8 @@
 
 #include "logging.h"
 #include "bpf/KernelUtils.h"
-#include "scopeguard.h"
 
+#include <android-base/scopeguard.h>
 #include <arpa/inet.h>
 #include <cerrno>
 #include <cstring>