[mutter/tintou/cogl-gir-header] cogl: Add main header for Cogl

[Corentin Noël <corentinnoel src gnome org>]

commit 7d3b0672274d2211c44119394d4dd8d7f9489057
Author: Corentin Noël <corentin elementary io>
Date:   Mon Mar 2 12:15:57 2020 +0100

    cogl: Add main header for Cogl
    
    This allows bindings linking to the C header to actually have the right one.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1101

 cogl/cogl/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/cogl/cogl/meson.build b/cogl/cogl/meson.build
index 0297a2485..be93ba2f9 100644
--- a/cogl/cogl/meson.build
+++ b/cogl/cogl/meson.build
@@ -478,6 +478,7 @@ if have_introspection
       '-D__COGL_GLX_H_INSIDE__',
       '-DCOGL_GIR_SCANNING',
     ],
+    header: 'cogl/cogl.h',
     install_dir_gir: pkglibdir,
     install_dir_typelib: pkglibdir,
     install: true