clean up Makefile
clean up Makefile

CTU-IIG/802.11p-iw,TeamEOS/external_iw,bw-oss/iw,idor/iw,cozybit/iw,idor/iw,ewa/iw-modified,OSLL/iw,TeamEOS/external_iw,chunyeow/iw,bcopeland/android_iw,timduru/platform-external-iw,Distrotech/iw,CTU-IIG/802.11p-iw,chunyeow/iw,bw-oss/iw,greearb/iw-ct,OSLL/iw,SoluMachines/external_iw,Distrotech/iw,greearb/iw-ct,SoluMachines/external_iw,ewa/iw-modified,cozybit/iw,bcopeland/android_iw,timduru/platform-external-iw