Get some of the last remaining C files into C++

They still need to be fixed up, but they now build with C++.

dpip/Makefile.am

@@ -4,5 +4,5 @@ AM_CPPFLAGS = \
 noinst_LIBRARIES = libDpip.a
 
 libDpip_a_SOURCES = \
-       dpip.h \
-       dpip.c
+       dpip.hh \
+       dpip.cc

dpip/dpip.cc

@@ -19,7 +19,7 @@
 #include <unistd.h>   /* for close */
 #include <fcntl.h>    /* for fcntl */
 
-#include "dpip.h"
+#include "dpip.hh"
 #include "d_size.h"
 
 #define RBUF_SZ 16*1024

dpip/dpip.hh

@@ -5,12 +5,12 @@
 #ifndef __DPIP_H__
 #define __DPIP_H__
 
+#include "../dlib/dlib.hh"
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
-#include "../dlib/dlib.h"
-
 /*
  * Communication mode flags
  */