[gxml] Enable Vala's ABI stability

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 88a2ea535d8f2ff9fbcfb67a8271ee1175a974d7
Author: Daniel Espinosa <esodan gmail com>
Date:   Wed Mar 20 10:51:07 2019 -0600

    Enable Vala's ABI stability

 gxml/meson.build | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gxml/meson.build b/gxml/meson.build
index e59d8a1..30f42ff 100644
--- a/gxml/meson.build
+++ b/gxml/meson.build
@@ -155,6 +155,9 @@ libgxml = library(VERSIONED_PROJECT_NAME,
        vala_vapi : VAPI_NAME,
        vala_gir : GIR_NAME,
        dependencies : [ gee, gio, xml, namespaceinfo_dep, inc_libh_dep, inc_rooth_dep ],
+       vala_args: [
+               '--abi-stability'
+       ],
        c_args : [
                '-include',
                meson.current_build_dir() + '/config.h',