Bug#619219: change depends, no need CLAPACK

[Youhei SASAKI <uwabami@gfd-dennou.org>]

Hi,

Upstream fixed dependencies of ruby-lapack. 
In new version(1.2.0), Ruby-Lapack don't need  CLAPACK.

Best Wishes,
---
Youhei SASAKI <uwabami@gfd-dennou.org>
              <uwabami@debian.or.jp>
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