[gimp] Don't forget to include <glib-object.h>

[Niels De Graef <nielsdg src gnome org>]

commit 9fce4757ce919b466538ecbebe6801416775dbaf
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Thu May 21 15:02:00 2020 +0200

    Don't forget to include <glib-object.h>
    
    ... when exposing symbols like `GType` in the header.

 libgimpbase/gimpbaseenums.h | 2 +-
 libgimpbase/gimpbasetypes.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/libgimpbase/gimpbaseenums.h b/libgimpbase/gimpbaseenums.h
index 3f4e7dd6ac..83600b1741 100644
--- a/libgimpbase/gimpbaseenums.h
+++ b/libgimpbase/gimpbaseenums.h
@@ -19,6 +19,7 @@
 #ifndef __GIMP_BASE_ENUMS_H__
 #define __GIMP_BASE_ENUMS_H__
 
+#include <glib-object.h>
 
 /**
  * SECTION: gimpbaseenums
@@ -28,7 +29,6 @@
  * Basic GIMP enumeration data types.
  **/
 
-
 G_BEGIN_DECLS
 
 /* For information look into the C source or the html documentation */
diff --git a/libgimpbase/gimpbasetypes.h b/libgimpbase/gimpbasetypes.h
index 3dc3409a95..f943140eed 100644
--- a/libgimpbase/gimpbasetypes.h
+++ b/libgimpbase/gimpbasetypes.h
@@ -19,6 +19,7 @@
 #ifndef __GIMP_BASE_TYPES_H__
 #define __GIMP_BASE_TYPES_H__
 
+#include <glib-object.h>
 
 #include <libgimpcolor/gimpcolortypes.h>
 #include <libgimpmath/gimpmathtypes.h>