Force alignment of data buffer used to process netlink messages

This avoids any overhead associated with accessing unaligned data
while processing netlink messages.

Change-Id: I1ea13051816ef46b6627594121d98cda130ac609
diff --git a/include/sysutils/NetlinkListener.h b/include/sysutils/NetlinkListener.h
index beb8bda..6e52c3b 100644
--- a/include/sysutils/NetlinkListener.h
+++ b/include/sysutils/NetlinkListener.h
@@ -21,7 +21,7 @@
 class NetlinkEvent;
 
 class NetlinkListener : public SocketListener {
-    char mBuffer[64 * 1024];
+    char mBuffer[64 * 1024] __attribute__((aligned(4)));
     int mFormat;
 
 public: