meson: use pkg-config method for libudev

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index 022272f..0e70fe7 100644
--- a/meson.build
+++ b/meson.build
@@ -403,6 +403,7 @@
 libudev = not_found
 if targetos == 'linux' and (have_system or have_tools)
   libudev = dependency('libudev',
+                       method: 'pkg-config',
                        required: get_option('libudev'),
                        static: enable_static)
 endif