(get_list_addr): Add an empty implementation of unsupported platforms.
(get_list_addr): Add an empty implementation of unsupported platforms.

(Logical change 1.233)

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