(mu_spawnvp): Change type of the 2nd argument.

@@ -104,7 +104,7 @@ extern char *mu_tempname (const char *tmpdir);
 extern char * mu_get_full_path (const char *file);
 extern char * mu_getcwd (void);
   
-extern int mu_spawnvp(const char* prog, const char* const av[], int* stat);
+extern int mu_spawnvp(const char* prog, char * const av[], int* stat);
 
 typedef void *(*mu_retrieve_fp) (void *);
 extern void mu_register_retriever (mu_list_t *pflist, mu_retrieve_fp fun);

@@ -655,7 +655,7 @@ mu_tempname (const char *tmpdir)
  * to find it.
  */
 int 
-mu_spawnvp (const char *prog, const char *const av_[], int *stat)
+mu_spawnvp (const char *prog, char * const av[], int *stat)
 {
   pid_t pid;
   int err = 0;
@@ -665,7 +665,6 @@ mu_spawnvp (const char *prog, const char *const av_[], int *stat)
   struct sigaction savequit;
   sigset_t chldmask;
   sigset_t savemask;
-  char **av = (char **) av_;
 
   if (!prog || !av)
     return EINVAL;