standardize some error messages

* maint.mk: (sc_error_message_warn_fatal, sc_error_message_uppercase):
(sc_error_message_period): Add automatic checks for non-standard error
messages.
* .x-sc_error_message_uppercase: explicit exclusion for this check
* src/cp.c: Standardize some error messages.
* src/date.c: Likewise.
* src/dircolors.c: Likewise.
* src/du.c: Likewise.
* src/expr.c: Likewise.
* src/install.c: Likewise.
* src/join.c: Likewise.
* src/ln.c: Likewise.
* src/mv.c: Likewise.
* src/od.c: Likewise.
* src/pr.c: Likewise.
* src/split.c: Likewise.
* src/truncate.c: Likewise.
* src/wc.c: Likewise.
* tests/du/files0-from: Expect new error message.
* tests/misc/join: Likewise.
* tests/misc/split-a: Likewise.
* tests/misc/wc-files0-from: Likewise.
* tests/misc/xstrtol: Likewise.
* lib/xmemxfrm.c: Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ln.c b/src/ln.c
index 137224073..2dc5628e8 100644
--- a/src/ln.c
+++ b/src/ln.c
@@ -507,7 +507,7 @@ main (int argc, char **argv)
     {
       if (target_directory)
 	error (EXIT_FAILURE, 0,
-	       _("Cannot combine --target-directory "
+	       _("cannot combine --target-directory "
 		 "and --no-target-directory"));
       if (n_files != 2)
 	{