kernel: remove more subtargets with the wrong kernel version or which are marked broken

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@41879 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/x86/Makefile

@@ -10,8 +10,7 @@ ARCH:=i386
 BOARD:=x86
 BOARDNAME:=x86
 FEATURES:=squashfs ext4 vdi vmdk pcmcia targz
-SUBTARGETS=generic olpc xen_domu net5501 kvm_guest geos alix2 thincan \
-	   rdc
+SUBTARGETS=generic olpc xen_domu net5501 kvm_guest alix2 thincan
 
 LINUX_VERSION:=3.10.49