meson: fix EGL/X11 build without GLX

dep_xcb and others were not set under this configuration.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
diff --git a/meson.build b/meson.build
index 709f77a..601085e 100644
--- a/meson.build
+++ b/meson.build
@@ -1361,7 +1361,7 @@
     dep_xfixes = dependency('xfixes')
     dep_xcb_glx = dependency('xcb-glx', version : '>= 1.8.1')
   endif
-  if (with_any_vk or with_glx == 'dri' or
+  if (with_any_vk or with_glx == 'dri' or with_egl or
        (with_gallium_vdpau or with_gallium_xvmc or with_gallium_va or
         with_gallium_omx != 'disabled'))
     dep_xcb = dependency('xcb')