[gxml] meson: added --includedir in GI generation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit bd5fa373fe7cd163764b2d623cd778dcdcde373a
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri Mar 2 12:34:47 2018 -0600

    meson: added --includedir in GI generation

 gxml/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gxml/meson.build b/gxml/meson.build
index ddd02f6..14c709f 100644
--- a/gxml/meson.build
+++ b/gxml/meson.build
@@ -169,6 +169,7 @@ custom_target('typelib',
                g_ir_compiler,
                '--shared-library', 'lib'+PROJECT_NAME+'-@0@.so'.format (API_VERSION),
                '--output', '@OUTPUT@',
+               '--includedir', join_paths(get_option('libdir'), 'girepository-1.0'),
                join_paths(meson.current_build_dir(), GIR_NAME)
        ],
        output: TYPELIB_NAME,