[gimp] gir: Make sure the GIR file includes the correct header

[Niels De Graef <nielsdg src gnome org>]

commit 58fecd7f8cd036b7997acd1ca5fd3e36afc24ea2
Author: Niels De Graef <niels degraef barco com>
Date:   Tue May 5 19:16:49 2020 +0200

    gir: Make sure the GIR file includes the correct header
    
    That way, bindings that still need to know the original C header that
    needs to be included (like Vala) are pointed to the correct place.

 libgimp/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgimp/meson.build b/libgimp/meson.build
index 7a24d7e088..dfc7c20063 100644
--- a/libgimp/meson.build
+++ b/libgimp/meson.build
@@ -376,6 +376,7 @@ else
     namespace: 'Gimp',
     identifier_prefix: 'Gimp',
     # symbol_prefix: 'gimp',
+    header: 'gimp-3.0/libgimp/gimp.h',
 
     extra_args: [
       '-DGIMP_COMPILATION',