[gxml/gxml-0.18] build: add support for darwin_versions

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 83162513161996888d09c2f0d30ad34fd16a56f3
Author: Tom Schoonjans <Tom Schoonjans diamond ac uk>
Date:   Fri Jul 5 13:09:48 2019 +0100

    build: add support for darwin_versions

 gxml/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gxml/meson.build b/gxml/meson.build
index 87f4384..8c080be 100644
--- a/gxml/meson.build
+++ b/gxml/meson.build
@@ -152,6 +152,7 @@ libgxml = library(VERSIONED_PROJECT_NAME,
        valasources+sources+configvapi,
        version : LT_VERSION,
        soversion : LT_VERSION+'.'+LT_AGE+'.'+LT_REVISION,
+       darwin_versions : [LT_CURRENT.to_int() + 1, '@0@.@1@'.format(LT_CURRENT.to_int() + 1, LT_REVISION)],
        vala_header : PROJECT_NAME+'.h',
        vala_vapi : VAPI_NAME,
        vala_gir : GIR_NAME,