boot/syslinux: allow build on x86_64

Signed-off-by: Heiko Zuerker <smiley73@users.sourceforge.net>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

boot/syslinux/Config.in

@@ -1,6 +1,6 @@
 config BR2_TARGET_SYSLINUX
 	bool "syslinux"
-	depends on BR2_i386
+	depends on BR2_i386 || BR2_x86_64
 	help
 	  The syslinux bootloader for x86 systems.
 	  This includes: syslinux, pxelinux, extlinux.