[gnome-builder] core: add missing include to public API

[Christian Hergert <chergert src gnome org>]

commit 3bc927678fa0a24595ee9d4dcb1daabe2d63604e
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 3 14:56:41 2021 -0800

    core: add missing include to public API

 src/libide/core/libide-core.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/core/libide-core.h b/src/libide/core/libide-core.h
index ddc67fbbc..85cb7a9a0 100644
--- a/src/libide/core/libide-core.h
+++ b/src/libide/core/libide-core.h
@@ -25,6 +25,7 @@
 #define IDE_CORE_INSIDE
 
 #include "ide-context.h"
+#include "ide-context-addin.h"
 #include "ide-debug.h"
 #include "ide-global.h"
 #include "ide-log.h"