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, 1 insertions, 1 deletions

diff --git a/src/paste.c b/src/paste.c
index 9dee94aa4..f04bcc3b1 100644
--- a/src/paste.c
+++ b/src/paste.c
@@ -496,7 +496,7 @@ main (int argc, char **argv)
     }
 
   if (optind == argc)
-    argv[argc++] = "-";
+    argv[argc++] = bad_cast ("-");
 
   if (collapse_escapes (delim_arg))
     {