[gnome-panel] action-button: link with x11 library

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d25c488e703c25cc367d354608091590d5cff235
Author: Dmitry Shachnev <mitya57 gmail com>
Date:   Fri May 15 20:40:50 2020 +0300

    action-button: link with x11 library
    
    Needed for XGetWindowProperty, XQueryTree, XKillClient, XInternAtom and
    XKeysymToKeycode functions.

 configure.ac | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/configure.ac b/configure.ac
index 28274f9fa..1916b5d01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -167,6 +167,7 @@ PKG_CHECK_MODULES([ACTION_BUTTON], [
   gio-unix-2.0 >= $GLIB_REQUIRED
   gtk+-3.0 >= $GTK_REQUIRED
   libsystemd >= $LIBSYSTEMD_REQUIRED
+  x11
 ])
 
 PKG_CHECK_MODULES(FISH, gtk+-3.0 >= $GTK_REQUIRED cairo >= $CAIRO_REQUIRED)