Don't check whether gnuplot is present in $PATH, because we know it is.

diff --git a/eazy-gnuplot.asd b/eazy-gnuplot.asd
index 7b1c09b..4657cd6 100644
--- a/eazy-gnuplot.asd
+++ b/eazy-gnuplot.asd
@@ -37,7 +37,4 @@
                                :fill-pointer t)))
           (setf (fill-pointer seq) (read-sequence seq stream))
           seq)))
-  :perform (load-op :before (op c)
-                    (unless (zerop (nth-value 2 (uiop:run-program "which gnuplot" :ignore-error-status t)))
-                      (warn "Could not find GNUPLOT in $PATH")))
   :in-order-to ((test-op (test-op eazy-gnuplot.test))))
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<tr><td><span title='2019-01-21 11:31:06 +0200'>2019-01-21</span></td><td><a href='/guix/commit/gnu/packages/moreutils.scm?id=26e4203be1044f6aa2004289864f5e1a421d7c88'>gnu: moreutils: Update to 0.63.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/moreutils.scm (moreutils): Update to 0.63.
[arguments]: All phases return #t.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-01-02 01:14:20 +0100'>2018-01-02</span></td><td><a href='/guix/commit/gnu/packages/moreutils.scm?id=c89b9d63e13ae1950d048bd7cdca7d0d1a367ebf'>gnu: moreutils: Update to 0.62.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/moreutils.scm (moreutils): Update to 0.62.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>