mac80211: libertas-spi: deactivate for UML target

The UML target does not have spi support.
This fixes a build problem found by the build bot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 49034

package/kernel/mac80211/Makefile

@@ -979,7 +979,7 @@ endef
 define KernelPackage/libertas-spi
   $(call KernelPackage/mac80211/Default)
   SUBMENU:=Wireless Drivers
-  DEPENDS+= +kmod-cfg80211 +kmod-lib80211 +@DRIVER_WEXT_SUPPORT +libertas-spi-firmware
+  DEPENDS+= +kmod-cfg80211 +kmod-lib80211 +@DRIVER_WEXT_SUPPORT @!TARGET_uml +libertas-spi-firmware
   KCONFIG := \
 	CONFIG_SPI=y \
 	CONFIG_SPI_MASTER=y