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

@@ -189,7 +189,7 @@ findOption (const tr_option * opts,
 int
 tr_getopt (const char         * usage,
            int                  argc,
-           const char **     argv,
+           const char * const  * argv,
            const tr_option     * opts,
            const char         ** setme_optarg)
 {

libtransmission/tr-getopt.h

@@ -52,7 +52,7 @@ enum
  */
 int  tr_getopt (const char          * summary,
                 int                   argc,
-                const char      ** argv,
+                const char * const  * argv,
                 const tr_option     * opts,
                 const char         ** setme_optarg);
 

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;