[vala/0.46] codegen: Include "glib.h" for g_return_*() usage

[Rico Tzschichholz <ricotz src gnome org>]

commit 4a11cc646bb2643c71b1c85a59668c4d041dc70d
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Mar 19 18:24:16 2020 +0100

    codegen: Include "glib.h" for g_return_*() usage
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/940

 codegen/valagtypemodule.vala | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/codegen/valagtypemodule.vala b/codegen/valagtypemodule.vala
index d4e0f3eec..dbdc7caf3 100644
--- a/codegen/valagtypemodule.vala
+++ b/codegen/valagtypemodule.vala
@@ -2477,6 +2477,9 @@ public class Vala.GTypeModule : GErrorModule {
                        ccheck.add_argument (cnonnull);
                }
 
+               // g_return_* needs glib.h
+               cfile.add_include ("glib.h");
+
                var cm = method_node as CreationMethod;
                if (cm != null && cm.parent_symbol is ObjectTypeSymbol) {
                        ccheck.call = new CCodeIdentifier ("g_return_val_if_fail");