[mutter] META_PLUGIN_DECLARE: don't emit an old-style definition

[Simon McVittie <smcv src gnome org>]

commit eb7f33265ab4ab2dd412e3313b43f5e3da209f74
Author: Simon McVittie <simon mcvittie collabora co uk>
Date:   Tue Aug 16 11:21:07 2016 +0100

    META_PLUGIN_DECLARE: don't emit an old-style definition
    
    An empty argument list means "unspecified arguments", and not
    "no arguments" like it does in C++. If an implementer of Mutter
    plugins uses gcc -Wold-style-definition, as configured by
    AX_COMPILER_FLAGS_CFLAGS, they will get warnings about this.
    
    Signed-off-by: Simon McVittie <simon mcvittie collabora co uk>
    Reviewed-by: Florian Müllner <fmuellner gnome org>
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=769971

 src/meta/meta-plugin.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/meta/meta-plugin.h b/src/meta/meta-plugin.h
index 07f8470..77a3648 100644
--- a/src/meta/meta-plugin.h
+++ b/src/meta/meta-plugin.h
@@ -299,7 +299,7 @@ struct _MetaPluginVersion
   GType meta_plugin_register_type (GTypeModule *type_module);           \
                                                                         \
   GType                                                                 \
-  object_name##_get_type ()                                             \
+  object_name##_get_type (void)                                         \
   {                                                                     \
     return g_define_type_id;                                            \
   }                                                                     \