(STACK_SIZE): Make it 128KB on x86.  SIGSTKSZ is far too small.
(STACK_SIZE): Make it 128KB on x86.  SIGSTKSZ is far too small.

(Logical change 1.131)

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