u-boot: unbreak build after r24674

Disable broken autoscript handling so the build atleast completes

target/u-boot/Makefile.in

@@ -199,7 +199,7 @@ $(TARGET_DIR)/usr/sbin/fw_printenv: $(U_BOOT_DIR)/$(U_BOOT_BIN)
 	$(STRIPCMD) $(STRIP_STRIP_UNNEEDED) $@
 	ln -sf fw_printenv $(TARGET_DIR)/usr/sbin/fw_setenv
 
-u-boot: $(BINARIES_DIR)/$(U_BOOT_BIN) $(U_BOOT_TOOLS) $(U_BOOT_TARGET_TOOLS) u-boot-autoscript
+u-boot: $(BINARIES_DIR)/$(U_BOOT_BIN) $(U_BOOT_TOOLS) $(U_BOOT_TARGET_TOOLS)
 
 u-boot-autoscript: $(U_BOOT_AUTOSCRIPT).$(PROJECT)