libs: encoder: h265: remove unused macro definition
libs: encoder: h265: remove unused macro definition

Since the h265 encoder doesn't use GValueArray, there is no need to
disable the Glib deprecation warnings, thus removing the macro
definition.

ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,GStreamer/gstreamer-vaapi,ceyusa/gstreamer-vaapi