Fix test build on FreeBSD.
Fix test build on FreeBSD.

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