abiword: build the mathview plugin

Without the gtkmathview dependency the abiword mathview plugin is not
 built,which prevent the edition of the math formulas(mathml or latex
 formulation)

I also had issues displaying the formulas on my eeepc 701
 (machine support will be commited soon) without the plugin:
 *The 3 top formulas of my document had a black rectangle on a part of
  them
 *the part after the black rectangle was truncated and mixed

Installing the plugin fixed both issues,but I noticied an issue
 with the latex notation where a \cdot was transformed in a C with
 a vertical bar in it(like the $)

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