[syslinux-iso] Fix double execution of initscripts hooks.

Partially revert commit b171f8f1

Fixes https://bugs.archlinux.org/task/23786

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

configs/syslinux-iso/overlay/etc/rc.conf

 #
 # /etc/rc.conf - Main Configuration for Arch Linux
 
-. /etc/rc.d/functions
+. /etc/archiso/functions
 
 LOCALE_DEFAULT="en_US.UTF-8"
 CLOCK_DEFAULT=""

configs/syslinux-iso/overlay/etc/rc.d/functions.d/automated_script

+. /etc/archiso/functions
+
 automated_script ()
 {
     script="$(kernel_cmdline script)"