new build-suse.txt, minor other patches

[Dave Peticolas]

Derek Atkins writes:
> It would be nice to be able to compile without guppi support.  I plan
> to work on this when I have time.  I'd certainly appreciate having the
> libguppi.m4 in the GnuCash macros directory so we don't have to depend
> on systems having it (such as when guppi isn't installed).

The problem is that if you do have libguppi.m4 in the right place,
you will get another error about the macro being defined in two
places.

So you need a configure argument (--enable-guppi, say), which, when
turned off, completely bypasses the macro altogether.

dave