Add -m option to useradd in archiso rc script.

This make the user home automatically with correct perms,
and also copies skel.

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

configs/syslinux-iso/overlay/etc/rc.d/archiso

@@ -66,10 +66,7 @@ do_makeuser ()
 {
     stat_busy "Making the default user arch"
     addgroups="audio,disk,optical,wheel"
-    useradd -p "" -g users -G $addgroups arch
-    mkdir /home/arch
-    chmod 700 /home/arch
-    chown arch:users /home/arch
+    useradd -m -p "" -g users -G $addgroups arch
     stat_done
 }