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/base64.c b/src/base64.c
index 7b4ffdaeb..cc1e6a760 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -83,7 +83,7 @@ When decoding, the input may contain newlines in addition to the bytes of\n\
 the formal base64 alphabet.  Use --ignore-garbage to attempt to recover\n\
 from any other non-alphabet bytes in the encoded stream.\n"),
              stdout);
-      emit_ancillary_info ();
+      emit_ancillary_info (PROGRAM_NAME);
     }
 
   exit (status);