Add http to kernel urls

src/slackware.ipxe

@@ -18,8 +18,8 @@ echo -n Enter version: ${} && read version
 set dir slackware/slackware${sbits}-${version}
 
 imgfree
-kernel ${mirror}/${dir}/kernels/huge.s/bzImage
-initrd ${mirror}/${dir}/isolinux/initrd.img
+kernel http://${mirror}/${dir}/kernels/huge.s/bzImage
+initrd http://${mirror}/${dir}/isolinux/initrd.img
 imgargs bzImage load_ramdisk=1 prompt_ramdisk=0 rw printk.time=0 SLACK_KERNEL=huge.s ${params}
 imgstat
 isset ${debug} && prompt ||