[libgepub] Fix the gir generation

[Daniel Garcia Moreno <danigm src gnome org>]

commit 2a0d922f5738d988bedfc98d2fc89038d39fa447
Author: Chris Lee <clee mg8 org>
Date:   Wed Feb 21 04:04:11 2018 -0700

    Fix the gir generation
    
    Set the proper C header name for the library, and also save the
    generated gir in a new variable so that it can be accessed to
    more easily generate API bindings.

 libgepub/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/libgepub/meson.build b/libgepub/meson.build
index 8ea5702..4485a5a 100644
--- a/libgepub/meson.build
+++ b/libgepub/meson.build
@@ -77,8 +77,9 @@ if get_option('introspection') and get_option('default_library') == 'shared'
   gir_dir = join_paths(gepub_datadir, '@0@-@1@'.format('gir', gepub_gir_version))
   typelib_dir = join_paths(gepub_libdir, '@0@-@1@'.format('girepository', gepub_gir_version))
 
-  gnome.generate_gir(
+  libgepub_gir = gnome.generate_gir(
     libgepub,
+    header: 'gepub.h',
     sources: sources + headers + private_headers,
     namespace: gepub_gir_ns,
     nsversion: gepub_api_version,