doc: output correct --help references with --program-prefix

* src/system.h (emit_ancillary_info): Take the invariant PROGRAM_NAME
as a parameter, so that consistent references are made to online docs
and texinfo nodes, when a --program-prefix is in place.  Note the
man pages don't need this fix as they're generated before the program
prefix is used.
* NEWS: Mention the improvements in references to online documentation.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/stdbuf.c b/src/stdbuf.c
index c8398abc6..d9cf02bf2 100644
--- a/src/stdbuf.c
+++ b/src/stdbuf.c
@@ -119,7 +119,7 @@ for e.g.) then that will override corresponding settings changed by 'stdbuf'.\n\
 Also some filters (like 'dd' and 'cat' etc.) don't use streams for I/O,\n\
 and are thus unaffected by 'stdbuf' settings.\n\
 "), stdout);
-      emit_ancillary_info ();
+      emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
 }