Re-enable X11 window support

X11 windows will never be HW accelerated (no GLX) but certain
certain symbols are expected to be present by other upstream
Debian packages.

BUG: 144185017
Change-Id: Ibc935bea0fb5035b542735311c23cca4f5c598df
diff --git a/debian/libgstreamer-gl.symbols b/debian/libgstreamer-gl.symbols
index b7ad400..b0529d6 100644
--- a/debian/libgstreamer-gl.symbols
+++ b/debian/libgstreamer-gl.symbols
@@ -109,6 +109,9 @@
  (arch=linux-any)gst_gl_display_wayland_get_type@Base 1.14.0
  (arch=linux-any)gst_gl_display_wayland_new@Base 1.14.0
  (arch=linux-any)gst_gl_display_wayland_new_with_display@Base 1.14.0
+ gst_gl_display_x11_get_type@Base 1.14.0
+ gst_gl_display_x11_new@Base 1.14.0
+ gst_gl_display_x11_new_with_display@Base 1.14.0
  gst_gl_element_propagate_display_context@Base 1.14.0
  gst_gl_ensure_element_data@Base 1.14.0
  gst_gl_filter_add_rgba_pad_templates@Base 1.14.0
diff --git a/debian/rules b/debian/rules
index 6aeb19d..026eb28 100755
--- a/debian/rules
+++ b/debian/rules
@@ -124,7 +124,7 @@
 	--enable-debug \
 	--enable-experimental \
 	--enable-wayland \
-	--disable-x11 \
+	--enable-x11 \
 	--disable-glx \
 	--disable-opengl \
 	--enable-gles2 \