armadillo: propagate clapack dependency

Commit 7b75d8c3 added a new dependency
to the clapack package, but forgot to propagate it to the reverse
dependencies, which in this case are just the armadillo package. This
commit fixes that.

Fixes:

  http://autobuild.buildroot.net/results/f34ad4f0cf094fa31b7dc18522e9eedfc5c2c940/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>