avoid warnings about discarding "qualifiers from pointer target type"

Use the new "bad_cast" function or an actual cast-to-"(char *)"
to avoid warnings.
* src/system.h (bad_cast): Define.
* src/chown.c (main):
* src/chroot.c (main):
* src/date.c (main):
* src/du.c (main):
* src/expand.c (stdin_argv):
* src/ls.c (decode_switches):
* src/md5sum.c (main):
* src/paste.c (main):
* src/pr.c (col_sep_string, column_separator, line_separator, main):
* src/sort.c (main):
* src/split.c (main):
* src/tail.c (main):
* src/unexpand.c (stdin_argv):
* src/yes.c (main):

1 files changed, 2 insertions, 2 deletions

diff --git a/src/chroot.c b/src/chroot.c
index 299acbcbf..1eb443c24 100644
--- a/src/chroot.c
+++ b/src/chroot.c
@@ -93,9 +93,9 @@ main (int argc, char **argv)
       /* No command.  Run an interactive shell.  */
       char *shell = getenv ("SHELL");
       if (shell == NULL)
-	shell = "/bin/sh";
+	shell = bad_cast ("/bin/sh");
       argv[0] = shell;
-      argv[1] = "-i";
+      argv[1] = bad_cast ("-i");
       argv[2] = NULL;
     }
   else