Remove interactive build for telega-server, as it fails on Guix.
Modify the `telega-server--find-bin' function to only use the version
of telega-server installed by Guix.

Created by Brett Gilio <brettg@gnu.org>

--- a/telega-server.el
+++ b/telega-server.el
@@ -113,7 +113,6 @@ If already deferring, then just executes the BODY."
 If BUILD-FLAGS is specified, then rebuild server without any
 queries using this flags for building, could be empty string.
 Otherwise query user about building flags."
-  (interactive)
   (telega-test-env 'quiet)
   (when (or build-flags
             (y-or-n-p "Build `telega-server'? "))
@@ -137,11 +136,8 @@ Otherwise query user about building flags."
 (defun telega-server--find-bin ()
   "Find telega-server executable.
 Raise error if not found."
-  (let ((exec-path (cons telega-directory exec-path)))
-    (or (executable-find "telega-server")
-        (progn (telega-server-build)
-               (executable-find "telega-server"))
-        (error "`telega-server' not found in exec-path"))))
+  (or (executable-find "telega-server")
+      (error "`telega-server' not found in exec-path")))
 
 (defun telega-server-version ()
   "Return telega-server version."

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<div class='path'>path: <a href='/guix/log/?id=4d2d578ee8e1dc1ad351b3516e8f3f9db5c030b9'>root</a>/<a href='/guix/log/scripts?id=4d2d578ee8e1dc1ad351b3516e8f3f9db5c030b9'>scripts</a>/<a href='/guix/log/scripts/guix.in?id=4d2d578ee8e1dc1ad351b3516e8f3f9db5c030b9'>guix.in</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/scripts/guix.in?id=4d2d578ee8e1dc1ad351b3516e8f3f9db5c030b9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-11 19:06:53 +0100'>2020-12-11</span></td><td><a href='/guix/commit/scripts/guix.in?id=fd247542215fbd10f28980f3d5255014b150e95a'>build: 'script/guix' uses our own 'guile' executable.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (do_subst): Substitute @abs_top_builddir@.
* scripts/guix.in: Use it.
</span></span></td><td>Ludovic Courtès</td></tr>