simetbox-openwrt-simet-lmapd: adjust Makefile for 0.13.2

simetbox-openwrt-simet-lmapd: adjust Makefile for 0.13.2

* Switch to simet-lmapd v0.13.2 (fix build when doxygen is installed)
* Reorder lines in Makefile so that it is easier to do a version
  lockdown (to be used in stable branches and simetbox version branches)