------------------------------------------------------------------------
  r4070 | marko | 2009-01-30 12:58:56 +0200 (Fri, 30 Jan 2009) | 6 lines

  branches/zip: ibuf_use_t: Add the constant IBUF_USE_COUNT, to eliminate
  a gcc warning about an assertion that trivially holds.
  The warning was introduced in r4061, in the merge of
  branches/innodb+ -r4053.

  ibuf_insert(): Let an assertion fail if ibuf_use is unknown.
  ------------------------------------------------------------------------