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='2022-01-11 11:47:42 +0530'>2022-01-11</span></td><td><a href='/guix/commit/gnu/services/ci.scm?id=c1f8dffa549edc0873c8b6956d9b288b51bea521'>services: laminar: Set LAMINAR_BIND_RPC environment variable.</a><span class='msg-avail'>...<span class='msg-tooltip'>Earlier, the bind-rpc field of &lt;laminar-configuration&gt; was not used at
all. This was a bug.

* gnu/services/ci.scm (laminar-shepherd-service): Use bind-rpc to set
LAMINAR_BIND_RPC environment variable.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2021-06-10 09:58:20 +0530'>2021-06-10</span></td><td><a href='/guix/commit/gnu/services/ci.scm?id=0d2cbd663214a8aa4ed8b8c7716fe3436801a9a5'>services: laminar: Create parent directory for unix socket.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/ci.scm (laminar-activation): New function.
(laminar-service-type): Extend activation-service-type with
laminar-activation.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2021-04-09 11:59:58 +0100'>2021-04-09</span></td><td><a href='/guix/commit/gnu/services/ci.scm?id=eda4bb4f16f74436b0caf1c584888c89b3c4c69b'>services: Add Laminar.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/ci.scm: New file.
* gnu/tests/ci.scm: New file.
* doc/guix.texi (Laminar): Document the Laminar service.
</span></span></td><td>Christopher Baines</td></tr>