misleading message and exit code when "program too old"

[Johannes Waldmann]

Hi. I am getting this:

Parsing...
error: program too old: 2.18.2 (file requires: 2.19.0)

but apparently it's not an error,
since the processing continues,
and the pdf file is produced.

but still, my Makefile is confused
because the exit code is 1 (not 0)

I can turn off exit code checking in the Makefile
but that's a drastic measure (I'll miss all other
errors as well).

- J.W.