future-proofing

I have opened a PR to add these macros to gstreamer itself, so this patch
adds #ifdef protection to the declarations here incase the patch is
accepted upstream.

src/lib/gstlal.h

@@ -80,12 +80,15 @@ LALUnit gstlal_lalUnitSquaredPerHertz(LALUnit);
  * Debugging helpers
  */
 
-
+#ifndef GST_TIME_SECONDS_FORMAT
 #define GST_TIME_SECONDS_FORMAT G_GUINT64_FORMAT ".%09" G_GUINT64_FORMAT " s"
 #define GST_TIME_SECONDS_ARGS(t) ((t) / GST_SECOND), ((t) % GST_SECOND)
+#endif /* GST_TIME_SECONDS_FORMAT */
 
-#define GST_BUFFER_BOUNDARIES_FORMAT ".d[%" GST_TIME_SECONDS_FORMAT ", %" GST_TIME_SECONDS_FORMAT ") = samples [%" G_GUINT64_FORMAT ", %" G_GUINT64_FORMAT ")"
+#ifndef GST_BUFFER_BOUNDARIES_FORMAT
+#define GST_BUFFER_BOUNDARIES_FORMAT ".d[%" GST_TIME_SECONDS_FORMAT ", %" GST_TIME_SECONDS_FORMAT ") = offsets [%" G_GUINT64_FORMAT ", %" G_GUINT64_FORMAT ")"
 #define GST_BUFFER_BOUNDARIES_ARGS(buf) 0, GST_TIME_SECONDS_ARGS(GST_BUFFER_TIMESTAMP(buf)), GST_TIME_SECONDS_ARGS(GST_BUFFER_TIMESTAMP(buf) + GST_BUFFER_DURATION(buf)), GST_BUFFER_OFFSET(buf), GST_BUFFER_OFFSET_END(buf)
+#endif /* GST_BUFFER_BOUNDARIES_FORMAT */
 
 
 G_END_DECLS