[gexiv2] build: Fix building gtk-doc

[Jens Georg <jensgeorg src gnome org>]

commit c01230e9434100862b2b6135e926f51bbf8a8d6d
Author: Jens Georg <mail jensge org>
Date:   Fri Nov 30 11:38:20 2018 +0100

    build: Fix building gtk-doc
    
    It was missing the gobject_types directive

 docs/reference/meson.build | 3 ++-
 gexiv2/meson.build         | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index cc91e64..1b5dea1 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -1,7 +1,8 @@
 subdir('xml')
 gnome.gtkdoc('gexiv2',
              main_xml : 'gexiv2-docs.xml',
+             gobject_typesfile : 'gexiv2.types',
              src_dir : [join_paths(meson.source_root(), 'gexiv2'),
                         join_paths(meson.build_root(), 'gexiv2')],
-             dependencies : gexiv2,
+             dependencies : libgexiv2,
              install : true)
diff --git a/gexiv2/meson.build b/gexiv2/meson.build
index a2c040a..ae7a238 100644
--- a/gexiv2/meson.build
+++ b/gexiv2/meson.build
@@ -66,6 +66,11 @@ gexiv2 = library('gexiv2',
                  dependencies : [gobject, exiv2],
                  install : true)
 
+libgexiv2 = declare_dependency(
+    link_with : gexiv2,
+    incldue_directories : include_directories('..')
+)
+
 pc_deps = ['glib-2.0', 'gobject-2.0']
 
 pkg.generate(