package/xenomai: remove sh4 support

sh4 target support has been removed since Xenomai 3.x.

Fixes:
http://autobuild.buildroot.net/results/a81/a8125847367de5fd27156e5cba9ec7315c2ccd5d/build-end.log

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xenomai/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_XENOMAI_ARCH_SUPPORTS
 	bool
 	default y
 	depends on BR2_i386 || BR2_x86_64 || (BR2_arm && !BR2_ARM_CPU_ARMV7M) || \
-		BR2_bfin || BR2_powerpc || BR2_sh4
+		BR2_bfin || BR2_powerpc
 
 comment "xenomai needs an glibc or uClibc toolchain w/ threads"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_TOOLCHAIN_USES_MUSL