pthread: Use a definition only if we have the old toolchain
#include <sys/types.h>
#include <sys/time.h>
+#include <sys/features.h>
+// Remove this when GCC 5.2.0 is no longer supported
+#ifndef _POSIX_TIMEOUTS
#define _POSIX_TIMEOUTS // For pthread_mutex_timedlock
+#endif
#include_next <pthread.h>
