Bug#845046: gnuplot-iostream FTBFS in stretch due to missing libblitz0-dev

[Adrian Bunk]

Source: gnuplot-iostream
Version: 0~20140302.gitc8919a0+dfsg-2
Severity: serious
Tags: stretch
Control: block -1 by 835373

gnuplot-iostream build-depends on libblitz0-dev,
which is not in testing due to #835373