[Kst] [Kst-plot/kst] 76f240: add missing export macro

[Peter Kümmel]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 76f240536d414484a6600f678124638b3747f89c
      https://github.com/Kst-plot/kst/commit/76f240536d414484a6600f678124638b3747f89c
  Author: Peter Kümmel <syntheticpp at gmx.net>
  Date:   2014-05-25 (Sun, 25 May 2014)

  Changed paths:
    M src/libkstmath/dataobjectscriptinterface.h

  Log Message:
  -----------
  add missing export macro