[PATCH] net/: fix the WIRELESS_EXT abuse

This patch contains the following changes:
- add a CONFIG_WIRELESS_EXT select'ed by NET_RADIO for conditional
  code
- remove the now no longer required #ifdef CONFIG_NET_RADIO from some
  #include's

Based on a patch by Jean Tourrilhes <jt@hpl.hp.com>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/core/Makefile b/net/core/Makefile
index 630da0f..79fe12c 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -14,5 +14,5 @@
 obj-$(CONFIG_SYSFS) += net-sysfs.o
 obj-$(CONFIG_NET_DIVERT) += dv.o
 obj-$(CONFIG_NET_PKTGEN) += pktgen.o
-obj-$(CONFIG_NET_RADIO) += wireless.o
+obj-$(CONFIG_WIRELESS_EXT) += wireless.o
 obj-$(CONFIG_NETPOLL) += netpoll.o