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, 6 insertions, 0 deletions

diff --git a/src/system.h b/src/system.h
index 8577d4464..ee0d25cd9 100644
--- a/src/system.h
+++ b/src/system.h
@@ -631,3 +631,9 @@ timetostr (time_t t, char *buf)
 	  ? imaxtostr (t, buf)
 	  : umaxtostr (t, buf));
 }
+
+static inline char *
+bad_cast (char const *s)
+{
+  return (char *) s;
+}