Implement for real.  Note: this version is currently broken. We don't pass sigmask the way this routine expects because it can't work.
Implement for real.  Note: this version is currently broken.
We don't pass sigmask the way this routine expects because it
can't work.

(Logical change 1.290)

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