Do not activate the mac80211 tracing for kernels <= 2.6.32

--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -24,7 +24,9 @@ mac80211-y := \
 	wme.o \
 	event.o \
 	chan.o \
-	trace.o mlme.o
+	mlme.o
+
+mac80211-$(CONFIG_COMPAT_MAC80211_DRIVER_API_TRACER) += trace.o
 
 mac80211-$(CONFIG_MAC80211_LEDS) += led.o
 mac80211-$(CONFIG_MAC80211_DEBUGFS) += \
