gpg 1.0.3 on Solaris w/ large file support

[Lars Hecking]

> For people looking at this general area of things, one of the best
> examples of how to handle large file support in configure is in the
> current version of GNU fileutils.  A version of that macro will be
> incorporated into the next release of autoconf (2.50).

 I'm already using AC_SYS_LARGEFILE. Paul Eggert, who wrote it,
 emailed me the latest version.

 But, as I said, I think the most pressing problem is iobuf.c.