Make gcc --std=c99 happy

We're now more or less C99 compliant

src/modules/echo-cancel/adrian-aec.c

@@ -10,6 +10,10 @@
  * Version 0.4 Leaky Normalized LMS - pre whitening algorithm
  */
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include <math.h>
 #include <string.h>
 #include <stdint.h>

src/modules/module-rygel-media-server.c

@@ -37,6 +37,7 @@
 #include <pulsecore/source.h>
 #include <pulsecore/core-util.h>
 #include <pulsecore/log.h>
+#include <pulsecore/macro.h>
 #include <pulsecore/modargs.h>
 #include <pulsecore/dbus-shared.h>
 #include <pulsecore/namereg.h>