Mention debugger requirements.
Mention debugger requirements.

(Logical change 1.9)

atanasyan/libunwind-android,SyndicateRogue/libunwind,libunwind/libunwind,zliu2014/libunwind-tilegx,jrmuizel/libunwind,igprof/libunwind,dreal-deps/libunwind,djwatson/libunwind,adsharma/libunwind,Chilledheart/libunwind,atanasyan/libunwind-android,0xlab/0xdroid-external_libunwind,rogwfu/libunwind,tronical/libunwind,androidarmv6/android_external_libunwind,evaautomation/libunwind,DroidSim/platform_external_libunwind,maltek/platform_external_libunwind,tkelman/libunwind,android-ia/platform_external_libunwind,pathscale/libunwind,SyndicateRogue/libunwind,martyone/libunwind,fdoray/libunwind,mpercy/libunwind,geekboxzone/lollipop_external_libunwind,bo-on-software/libunwind,android-ia/platform_external_libunwind,tony/libunwind,0xlab/0xdroid-external_libunwind,Keno/libunwind,atanasyan/libunwind,cloudius-systems/libunwind,androidarmv6/android_external_libunwind,android-ia/platform_external_libunwind,krytarowski/libunwind,bo-on-software/libunwind,olibc/libunwind,cms-externals/libunwind,CyanogenMod/android_external_libunwind,dagar/libunwind,vegard/libunwind,martyone/libunwind,djwatson/libunwind,geekboxzone/mmallow_external_libunwind,mpercy/libunwind,vtjnash/libunwind,cms-externals/libunwind,zliu2014/libunwind-tilegx,vtjnash/libunwind,Keno/libunwind,atanasyan/libunwind,project-zerus/libunwind,rantala/libunwind,unkadoug/libunwind,wdv4758h/libunwind,tronical/libunwind,tronical/libunwind,project-zerus/libunwind,tony/libunwind,rantala/libunwind,joyent/libunwind,frida/libunwind,dropbox/libunwind,evaautomation/libunwind,maltek/platform_external_libunwind,geekboxzone/mmallow_external_libunwind,atanasyan/libunwind-android,dropbox/libunwind,fillexen/libunwind,dreal-deps/libunwind,igprof/libunwind,Chilledheart/libunwind,vtjnash/libunwind,Keno/libunwind,DroidSim/platform_external_libunwind,bo-on-software/libunwind,vegard/libunwind,krytarowski/libunwind,dreal-deps/libunwind,maltek/platform_external_libunwind,martyone/libunwind,fdoray/libunwind,olibc/libunwind,rntz/libunwind,atanasyan/libunwind,geekboxzone/mmallow_external_libunwind,lat/libunwind,wdv4758h/libunwind,jrmuizel/libunwind,Chilledheart/libunwind,project-zerus/libunwind,jrmuizel/libunwind,zeldin/platform_external_libunwind,SyndicateRogue/libunwind,evaautomation/libunwind,rntz/libunwind,libunwind/libunwind,rantala/libunwind,libunwind/libunwind,unkadoug/libunwind,unkadoug/libunwind,zeldin/platform_external_libunwind,dagar/libunwind,adsharma/libunwind,krytarowski/libunwind,lat/libunwind,olibc/libunwind,geekboxzone/lollipop_external_libunwind,DroidSim/platform_external_libunwind,yuyichao/libunwind,0xlab/0xdroid-external_libunwind,tony/libunwind,ehsan/libunwind,zeldin/platform_external_libunwind,cloudius-systems/libunwind,tkelman/libunwind,cloudius-systems/libunwind,fillexen/libunwind,mpercy/libunwind,frida/libunwind,pathscale/libunwind,dropbox/libunwind,joyent/libunwind,djwatson/libunwind,dagar/libunwind,rogwfu/libunwind,CyanogenMod/android_external_libunwind,adsharma/libunwind,androidarmv6/android_external_libunwind,frida/libunwind,vegard/libunwind,lat/libunwind,fdoray/libunwind,pathscale/libunwind,ehsan/libunwind,geekboxzone/lollipop_external_libunwind,wdv4758h/libunwind,joyent/libunwind,fillexen/libunwind,cms-externals/libunwind,rogwfu/libunwind,igprof/libunwind,tkelman/libunwind,zliu2014/libunwind-tilegx,ehsan/libunwind,yuyichao/libunwind,yuyichao/libunwind,CyanogenMod/android_external_libunwind,rntz/libunwind