rc/pkg: remove the automount features, they are not needed anymore

The new package targets have no drawbacks compared to auto live
mount, but the latter has proven difficult and does not match the
normal boot scenario and could potentially panic due to unionfs
being broken beyond repair (kib@'s words in spirit, not mine).

Discussed with: @AdSchellevis

+POST_INSTALL

@@ -12,8 +12,7 @@ cp /etc/rc /etc/rc.bak
 cat > /etc/rc <<EOF
 #!/bin/sh
 # OPNsense rc(8) hook was automatically installed:
-if [ -f /root/core/src/etc/rc ]; then /root/core/src/etc/rc; exit 0;
-elif [ -f /usr/local/etc/rc ]; then /usr/local/etc/rc; exit 0; fi
+if [ -f /usr/local/etc/rc ]; then /usr/local/etc/rc; exit 0; fi
 EOF
 cat /etc/rc.bak >> /etc/rc
 rm -f /etc/rc.bak

+PRE_DEINSTALL

@@ -8,5 +8,5 @@ rm -f /etc/shells.bak
 
 echo "Unhooking from /etc/rc"
 cp /etc/rc /etc/rc.bak
-tail -n +5 /etc/rc.bak > /etc/rc
+tail -n +4 /etc/rc.bak > /etc/rc
 rm -f /etc/rc.bak

src/etc/rc

@@ -61,11 +61,6 @@ else
 	done
 fi
 
-# mount repo if available
-if [ -d /root/core ]; then
-	make -C /root/core mount
-fi
-
 # regenerate groups and users
 /usr/local/etc/rc.recover > /dev/null