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/seq.c b/src/seq.c
index 7943824d1..39a300186 100644
--- a/src/seq.c
+++ b/src/seq.c
@@ -98,7 +98,7 @@ FORMAT must be suitable for printing one argument of type 'double';\n\
 it defaults to %.PRECf if FIRST, INCREMENT, and LAST are all fixed point\n\
 decimal numbers with maximum precision PREC, and to %g otherwise.\n\
 "), stdout);
-      emit_ancillary_info ();
+      emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
 }