make internal implementation of fls() the default as it is missing on my Linux box
make internal implementation of fls() the default as it is missing on my Linux box

gebart/libcoap,sgso/libcoap,joaopedrotaveira/libcoap,gebart/libcoap,nmacs/libcoap,OlegHahm/libcoap,PolymorhicCode/libcoap,RIOT-OS/libcoap,fredericgermain/libcoap,authmillenon/libcoap,authmillenon/libcoap,joaopedrotaveira/libcoap,alexaring/libcoap,thecodemaiden/libcoap-fork,markushx/libcoap,sgso/libcoap,pabigot/libcoap,OlegHahm/libcoap,joaopedrotaveira/libcoap,OlegHahm/libcoap,gebart/libcoap,authmillenon/libcoap,fredericgermain/libcoap,markushx/libcoap,RIOT-OS/libcoap,pabigot/libcoap,fredericgermain/libcoap,markushx/libcoap,alexaring/libcoap,sgso/libcoap,alexaring/libcoap,nmacs/libcoap,pabigot/libcoap,thecodemaiden/libcoap-fork,nmacs/libcoap