building 2.1.19

[Ross A. Lippert]

OK, the build proceeded fine with only two trouble points:
texi2html -expandinfo -split_chapter -I./.. octave.texi
*** Undefined node (sysupdate):      are currently up-to-date with the
primary system type (@xref{sysupdate}).
*** Undefined node (sysgettype):  primary system form (default); see
@ref{sysgettype}.

And still make check doesn't work, and I don't know why.

-r