Remove check for hardcoded Xwayland path in gdm.

diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
index 7de7b99c..065325f4 100644
--- a/daemon/gdm-local-display-factory.c
+++ b/daemon/gdm-local-display-factory.c
@@ -245,9 +245,9 @@ struct GdmDisplayServerConfiguration {
         const char *session_type;
 } display_server_configuration[] = {
 #ifdef ENABLE_WAYLAND_SUPPORT
-        { "wayland", GDM_KEY_WAYLAND_ENABLE, "/usr/bin/Xwayland", "wayland" },
+        { "wayland", GDM_KEY_WAYLAND_ENABLE, "", "wayland" },
 #endif
-        { "xorg", GDM_KEY_XORG_ENABLE, "/usr/bin/Xorg", "x11" },
+        { "xorg", GDM_KEY_XORG_ENABLE, "", "x11" },
         { NULL, NULL, NULL },
 };
 
@@ -269,9 +269,6 @@ display_server_enabled (GdmLocalDisplayFactory *factory,
                 if (!gdm_settings_direct_get_boolean (key, &enabled) || !enabled)
                         return FALSE;
 
-                if (!g_file_test (binary, G_FILE_TEST_IS_EXECUTABLE))
-                        return FALSE;
-
                 return TRUE;
         }
 
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<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/zile.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-08 17:12:26 +0200'>2021-07-08</span></td><td><a href='/guix/commit/gnu/packages/zile.scm?id=beaa5dff38db8c31a99d7f4484864b12c838b4e2'>gnu: zile-on-guile: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a follow-up of da40d07066096a3b5a852041ea01fbb32240deda.

* gnu/packages/zile.scm (zile-on-guile)[arguments]: Restore the original
patch-/bin/sh phase.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2021-07-08 16:22:49 +0200'>2021-07-08</span></td><td><a href='/guix/commit/gnu/packages/zile.scm?id=da40d07066096a3b5a852041ea01fbb32240deda'>gnu: zile: Update to 2.6.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/zile.scm (zile): Update to 2.6.2.
[arguments]: Adjust file list in custom 'patch-/bin/sh phase.
[inputs]: Add gee and glib.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Matthew James Kraai</td></tr>