[gupnp] build: Add missing libxml2_dep variable

[Jens Georg <jensgeorg src gnome org>]

commit d70935ae60b9c4388c82922149a2fab2d292de4c
Author: Jens Georg <mail jensge org>
Date:   Sat Sep 3 10:42:43 2022 +0200

    build: Add missing libxml2_dep variable

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index caad6e6..d854e6c 100644
--- a/meson.build
+++ b/meson.build
@@ -30,8 +30,8 @@ conf.set('GLIB_VERSION_MAX_ALLOWED', 'GLIB_VERSION_2_70'.format(glib_version.und
 subdir('internal')
 
 gssdp_dep = dependency('gssdp-1.6', version : '>= 1.5.2', default_options: ['sniffer=false'], fallback: 
'gssdp-1.6')
-
 gio_unix = dependency('gio-unix-2.0', version: '>= 2.44', required: host_machine.system() != 'windows')
+libxml_dep = dependency('libxml-2.0')
 
 dependencies = [
     dependency('glib-2.0', version : '>= ' + glib_version),
@@ -40,7 +40,7 @@ dependencies = [
     dependency('gobject-2.0', version : '>= ' + glib_version),
     dependency('libsoup-3.0', version : '>= 2.99.0'),
     gssdp_dep,
-    dependency('libxml-2.0'),
+    libxml_dep
 ]
 
 subdir('libgupnp')