build fix (trunk only)

build fix (trunk only)

     The recent SYSCF patch introduced a build problem even though I
haven't attempt to use that new stuff yet.  My compiler complained that
`out' in build_english_list() was used without being initialized, which
in turn caused make to quit.  The compiler was right; only the words==1
case actually set up the output buffer.  Once that buffer was fixed, the
routine to copy a single word was overwriting it on each call instead of
building up via appending as intended.

     I changed the 3 or more case to yield "A, B, or C" like Keni wrote
in his description rather than the "A, B or C" which was being produced.
I'm pretty sure that both forms are considered acceptible; I've always
used the first one with an extra comma in front of and/or.