The static VisPluginInfo in nastyfft was declared as const, but libvisual write
to its refcount when it visual_object_unref()s it (nasty!).  This is broken at
various levels: libvisual shouldn't be writing to this static plugin which is
allocated by a dlopen()ed plugin, and it should also honor the "const
VisPluginInfo" API...  Anyway, nastyfft was the only occurrence and this fixes
the crash for now; LP: #287448.

--- libvisual-plugins-0.4.0.dfsg.1.orig/plugins/actor/nastyfft/actor_nastyfft.c
+++ libvisual-plugins-0.4.0.dfsg.1/plugins/actor/nastyfft/actor_nastyfft.c
@@ -80,7 +80,7 @@
 		.vidoptions.depth = VISUAL_VIDEO_DEPTH_GL
 	}};
 
-	static const VisPluginInfo info[] = {{
+	static VisPluginInfo info[] = {{
 		.type = VISUAL_PLUGIN_TYPE_ACTOR,
 
 		.plugname = N_("nastyfft"),