gnulib: Use basename() from gnulib module 'dirname'

Avoid basename incompatibilities between POSIX and GNU implementations.
Also, libgen.h isn't needed any more which increases compatibility.

bootstrap.conf

@@ -36,6 +36,7 @@ c-strcasestr
 clock-time
 close
 connect
+dirname
 fcntl
 fnmatch
 futimens

src/main.c

@@ -56,6 +56,7 @@ as that of the covered work.  */
 #include "warc.h"
 #include "version.h"
 #include "c-strcase.h"
+#include "dirname.h"
 #include <getopt.h>
 #include <getpass.h>
 #include <quote.h>
@@ -1033,11 +1034,7 @@ main (int argc, char **argv)
   /* On VMS, lose the "dev:[dir]" prefix and the ".EXE;nnn" suffix. */
   exec_name = vms_basename (argv[0]);
 #else /* def __VMS */
-  exec_name = strrchr (argv[0], PATH_SEPARATOR);
-  if (!exec_name)
-    exec_name = argv[0];
-  else
-    ++exec_name;
+  exec_name = basename (argv[0]);
 #endif /* def __VMS [else] */
 
 #ifdef WINDOWS

src/warc.c

@@ -35,6 +35,7 @@ as that of the covered work.  */
 #include "hash.h"
 #include "utils.h"
 #include "version.h"
+#include "dirname.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -54,19 +55,21 @@ as that of the covered work.  */
 #include <uuid.h>
 #endif
 
-#ifndef WINDOWS
-#include <libgen.h>
-#else
-#include <fcntl.h>
-#endif
-
 #include "warc.h"
 #include "exits.h"
 
+#ifdef WINDOWS
+/* we need this on Windows to have O_TEMPORARY defined */
+#include <fcntl.h>
+#endif
+
 #ifndef O_TEMPORARY
 #define O_TEMPORARY 0
 #endif
 
+#include "warc.h"
+#include "exits.h"
+
 
 /* The log file (a temporary file that contains a copy
    of the wget log). */
@@ -671,7 +674,7 @@ warc_write_warcinfo_record (char *filename)
 {
   FILE *warc_tmp;
   char timestamp[22];
-  char *filename_copy, *filename_basename;
+  char *filename_basename;
 
   /* Write warc-info record as the first record of the file. */
   /* We add the record id of this info record to the other records in the
@@ -681,8 +684,7 @@ warc_write_warcinfo_record (char *filename)
 
   warc_timestamp (timestamp, sizeof(timestamp));
 
-  filename_copy = strdup (filename);
-  filename_basename = strdup (basename (filename_copy));
+  filename_basename = basename (filename);
 
   warc_write_start_record ();
   warc_write_header ("WARC-Type", "warcinfo");
@@ -695,8 +697,6 @@ warc_write_warcinfo_record (char *filename)
   warc_tmp = warc_tempfile ();
   if (warc_tmp == NULL)
     {
-      xfree (filename_copy);
-      xfree (filename_basename);
       return false;
     }
 
@@ -722,8 +722,6 @@ warc_write_warcinfo_record (char *filename)
   if (! warc_write_ok)
     logprintf (LOG_NOTQUIET, _("Error writing warcinfo record to WARC file.\n"));
 
-  xfree (filename_copy);
-  xfree (filename_basename);
   fclose (warc_tmp);
   return warc_write_ok;
 }