Add tests/xmlbuffer.c, forgotten in r2569
Add tests/xmlbuffer.c, forgotten in r2569

This commit was SVN r2570.

The following SVN revision numbers were found above:
  r2569 --> 673b901298c1f7bdfbc8c0c6ef585205c86d00ba

shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc