[xml/sgml-pkgs] Bug#263858: Fix for patch

[Christian Ambach]

I've fixed your patch Martin,

you only missed one modification in configure.

[...]
dnl If the API changes compatibly (i.e. simply adding a new function
dnl without changing or removing earlier interfaces), then increment LIBAGE.
dnl
dnl If the API changes incompatibly set LIBAGE back to 0
dnl

LIBCURRENT=1
LIBREVISION=0
LIBAGE=0
[...]

After changing that, you can build a package which contains
libexpat.so.1.0.0.

Have fun :D