When libunwind is configured with --enable-block-signals=no, we must block recursion via sighandlers by "external" means.
When libunwind is configured with --enable-block-signals=no,
we must block recursion via sighandlers by "external" means.

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