fix const warnings

In particular, in passing argv around as a "const char * const *"
instead of a "const char *".

daemon/daemon.c

@@ -163,7 +163,7 @@ reopen_log_file (const char *filename)
 }
 
 static const char*
-getConfigDir (int argc, const char ** argv)
+getConfigDir (int argc, const char * const * argv)
 {
     int c;
     const char * configDir = NULL;

daemon/remote.c

@@ -1834,7 +1834,7 @@ ensure_tset (tr_variant ** tset)
 }
 
 static int
-processArgs (const char * rpcurl, int argc, const char ** argv)
+processArgs (const char * rpcurl, int argc, const char * const * argv)
 {
     int c;
     int status = EXIT_SUCCESS;

libtransmission/tr-getopt.c

@@ -187,11 +187,11 @@ findOption (const tr_option * opts,
 }
 
 int
-tr_getopt (const char *      usage,
-           int               argc,
-           const char **     argv,
-           const tr_option * opts,
-           const char **     setme_optarg)
+tr_getopt (const char         * usage,
+           int                  argc,
+           const char * const  * argv,
+           const tr_option     * opts,
+           const char         ** setme_optarg)
 {
     int               i;
     const char *      arg = NULL;

libtransmission/tr-getopt.h

@@ -50,11 +50,11 @@ enum
  * @brief similar to getopt ()
  * @return TR_GETOPT_DONE, TR_GETOPT_ERR, TR_GETOPT_UNK, or the matching tr_option's `val' field
  */
-int  tr_getopt (const char       * summary,
-                int                argc,
-                const char      ** argv,
-                const tr_option  * opts,
-                const char      ** setme_optarg);
+int  tr_getopt (const char          * summary,
+                int                   argc,
+                const char * const  * argv,
+                const tr_option     * opts,
+                const char         ** setme_optarg);
 
 /** @brief prints the `Usage' help section to stdout */
 void tr_getopt_usage (const char       * appName,

utils/create.c

@@ -51,7 +51,7 @@ getUsage (void)
 }
 
 static int
-parseCommandLine (int argc, const char ** argv)
+parseCommandLine (int argc, const char * const * argv)
 {
   int c;
   const char * optarg;

utils/edit.c

@@ -45,7 +45,7 @@ getUsage (void)
 }
 
 static int
-parseCommandLine (int argc, const char ** argv)
+parseCommandLine (int argc, const char * const * argv)
 {
   int c;
   const char * optarg;

utils/show.c

@@ -49,7 +49,7 @@ static bool showVersion = false;
 const char * filename = NULL;
 
 static int
-parseCommandLine (int argc, const char ** argv)
+parseCommandLine (int argc, const char * const * argv)
 {
   int c;
   const char * optarg;