xenomai: restrict to the set of supported architectures

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/Config.ext.in

@@ -3,6 +3,8 @@ menu "Linux Kernel Extensions"
 # Xenomai
 config BR2_LINUX_KERNEL_EXT_XENOMAI
 	bool "Adeos/Xenomai Real-time patch"
+	depends on BR2_i386 || BR2_x86_64 || BR2_arm || \
+		   BR2_bfin || BR2_powerpc || BR2_sh4
 	select BR2_PACKAGE_XENOMAI
 	help
 	  Xenomai Kernel part.

package/xenomai/Config.in

@@ -1,5 +1,7 @@
 config BR2_PACKAGE_XENOMAI
 	bool "Xenomai Userspace"
+	depends on BR2_i386 || BR2_x86_64 || BR2_arm || \
+		   BR2_bfin || BR2_powerpc || BR2_sh4
 	help
 	  Real-Time Framework for Linux
 	  http://www.xenomai.org