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

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

dpi/bookmarks.cc

@@ -35,7 +35,7 @@
 #include <netdb.h>
 #include <fcntl.h>
 #include <signal.h>
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 
 

dpi/cookies.cc

@@ -49,7 +49,7 @@ int main(void)
 #include <netdb.h>
 #include <signal.h>
 #include "dpiutil.hh"
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 
 
 /*

dpi/datauri.cc

@@ -18,7 +18,7 @@
 #include <ctype.h>
 #include <errno.h>
 
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 #include "../src/misc.hh"
 

dpi/downloads.cc

@@ -49,7 +49,7 @@
 
 #include "config.h"
 #include "dpiutil.hh"
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 
 /*
  * Debugging macros

dpi/dpiutil.hh

@@ -20,7 +20,7 @@
 
 #include <stdio.h>
 #include "d_size.h"
-#include "../dlib/dlib.h"
+#include "../dlib/dlib.hh"
 
 
 #ifdef __cplusplus

dpi/file.cc

@@ -34,7 +34,7 @@
 #include <signal.h>
 #include <netinet/in.h>
 
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 #include "d_size.h"
 

dpi/ftp.cc

@@ -41,7 +41,7 @@
 #include <sys/time.h>
 #include <ctype.h>
 
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 #include "d_size.h"
 

dpi/hello.cc

@@ -18,7 +18,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 
 /*

dpi/vsource.cc

@@ -19,7 +19,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
-#include "../dpip/dpip.h"
+#include "../dpip/dpip.hh"
 #include "dpiutil.hh"
 
 /*