Cosmetic changes to netd client files.

+ Name the dispatch header correctly (NetdClientDispatch.h).
+ Hide the global dispatch variable (__netdClientDispatch).
+ Explain why it's okay to read the variable without locking.
+ Use quotes instead of angle-brackets for non-system includes.
+ Add necessary declarations for C compiles (and not just C++).

Change-Id: Id0932165e71d81da5fce77a684f40c2263f58e61

libc/bionic/accept.cpp

@@ -14,7 +14,8 @@
  * limitations under the License.
  */
 
-#include <private/NetdClient.h>
+#include "private/NetdClientDispatch.h"
+
 #include <sys/socket.h>
 
 int accept(int sockfd, sockaddr* addr, socklen_t* addrlen) {