Added target install recipe to Makefile
Added target install recipe to Makefile

nmacs/libcoap,sgso/libcoap,thecodemaiden/libcoap-fork,gebart/libcoap,thecodemaiden/libcoap-fork,authmillenon/libcoap,PolymorhicCode/libcoap,fredericgermain/libcoap,gebart/libcoap,sgso/libcoap,sgso/libcoap,alexaring/libcoap,RIOT-OS/libcoap,fredericgermain/libcoap,RIOT-OS/libcoap,authmillenon/libcoap,alexaring/libcoap,alexaring/libcoap,fredericgermain/libcoap,nmacs/libcoap,authmillenon/libcoap,nmacs/libcoap,gebart/libcoap